diff --git a/curriculum/challenges/arabic/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md b/curriculum/challenges/arabic/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
index 9f6ce12b4d8..c2dac79b728 100644
--- a/curriculum/challenges/arabic/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
+++ b/curriculum/challenges/arabic/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
@@ -21,9 +21,8 @@ Complete the function using the rules below to modify the object passed to the f
 
 -   Your function must always return the entire `records` object.
 -   If `value` is an empty string, delete the given `prop` property from the album.
--   If `prop` isn’t `"tracks"` and `value` isn't an empty string, assign the `value` to that album’s `prop`.
--   If `prop` is `"tracks"` and `value` isn’t an empty string, add the `value` to the end of the album’s existing `"tracks"` array.
--   If the album doesn’t have a `"tracks"` property, create a new array for the album's `"tracks"` property before adding the `value` to it.
+-   If `prop` isn't `tracks` and `value` isn't an empty string, assign the `value` to that album's `prop`.
+-   If `prop` is `tracks` and value isn't an empty string, add the `value` to the end of the album's `tracks` array. You need to create this array first if the album does not have a `tracks` property.
 
 **Note:** A copy of the `recordCollection` object is used for the tests. You should not directly modify the `recordCollection` object.
 
diff --git a/curriculum/challenges/arabic/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md b/curriculum/challenges/arabic/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
index dbe1d9b5301..3b4895acece 100644
--- a/curriculum/challenges/arabic/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
+++ b/curriculum/challenges/arabic/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
@@ -35,6 +35,12 @@ assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(ru
 assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].some(css => css?.keyText === '40%'));
 ```
 
+You should have 4 waypoints in your keyframe.
+
+```js
+assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].length === 4);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/chinese-traditional/00-certifications/college-algebra-with-python-certification/college-algebra-with-python-certification.yml b/curriculum/challenges/chinese-traditional/00-certifications/college-algebra-with-python-certification/college-algebra-with-python-certification.yml
index 8d08c54ba6f..d83cac69791 100644
--- a/curriculum/challenges/chinese-traditional/00-certifications/college-algebra-with-python-certification/college-algebra-with-python-certification.yml
+++ b/curriculum/challenges/chinese-traditional/00-certifications/college-algebra-with-python-certification/college-algebra-with-python-certification.yml
@@ -7,16 +7,16 @@ isPrivate: true
 tests:
   - 
     id: 63d83ff239c73468b059cd3f
-    title: Build a Multi-Function Calculator
+    title: 創建一個多功能計算器
   - 
     id: 63d83ffd39c73468b059cd40
-    title: Build a Graphing Calculator
+    title: 創建一個圖形計算器
   - 
     id: 63d8401039c73468b059cd41
-    title: Build Three Math Games
+    title: 創建三個數學遊戲
   - 
     id: 63d8401e39c73468b059cd42
-    title: Build a Financial Calculator
+    title: 創建一個財務計算器
   - 
     id: 63d8402e39c73468b059cd43
-    title: Build a Data Graph Explorer
+    title: 創建一個數據圖表瀏覽器
diff --git a/curriculum/challenges/chinese-traditional/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md b/curriculum/challenges/chinese-traditional/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
index 0e2cab49446..ca0254eb5cf 100644
--- a/curriculum/challenges/chinese-traditional/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
+++ b/curriculum/challenges/chinese-traditional/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
@@ -8,28 +8,27 @@ dashedName: record-collection
 
 # --description--
 
-You are creating a function that aids in the maintenance of a musical album collection. The collection is organized as an object that contains multiple albums which are also objects. Each album is represented in the collection with a unique `id` as the property name. Within each album object, there are various properties describing information about the album. Not all albums have complete information.
+你將創建一個幫助維護音樂專輯集的函數。 這個集合是一個包含多個相冊的對象，這些相冊也是對象。 每張專輯在集合中以唯一的 `id` 作爲屬性名來表示。 在每個專輯對象中，有各種描述專輯信息的屬性。 並非所有專輯都有完整的信息。
 
-The `updateRecords` function takes 4 arguments represented by the following function parameters:
+`updateRecords` 函數有 4 個參數，即以下參數：
 
--   `records` - an object containing several individual albums
--   `id` - a number representing a specific album in the `records` object
--   `prop` - a string representing the name of the album’s property to update
--   `value` - a string containing the information used to update the album’s property
+-   `records` - 一個包含多個專輯的對象
+-   `id` - 一個數字，代表 `records` 對象中特定的專輯
+-   `prop` - 一個字符串，代表相冊屬性名稱
+-   `value` - 一個字符串，包含用來更新相冊屬性的信息
 
-Complete the function using the rules below to modify the object passed to the function.
+使用下面的規則完成函數來修改傳遞給函數的對象。
 
--   Your function must always return the entire `records` object.
--   If `value` is an empty string, delete the given `prop` property from the album.
--   If `prop` isn’t `"tracks"` and `value` isn't an empty string, assign the `value` to that album’s `prop`.
--   If `prop` is `"tracks"` and `value` isn’t an empty string, add the `value` to the end of the album’s existing `"tracks"` array.
--   If the album doesn’t have a `"tracks"` property, create a new array for the album's `"tracks"` property before adding the `value` to it.
+-   你的函數必須始終返回整個 `records` 對象。
+-   如果 `value` 是空字符串，從專輯裏刪除指定的 `prop`。
+-   If `prop` isn't `tracks` and `value` isn't an empty string, assign the `value` to that album's `prop`.
+-   If `prop` is `tracks` and value isn't an empty string, add the `value` to the end of the album's `tracks` array. You need to create this array first if the album does not have a `tracks` property.
 
-**Note:** A copy of the `recordCollection` object is used for the tests. You should not directly modify the `recordCollection` object.
+**注意：** 將 `recordCollection` 對象的副本用於測試。 你不應該直接修改 `recordCollection` 對象。
 
 # --hints--
 
-After `updateRecords(recordCollection, 5439, "artist", "ABBA")`, `artist` should be the string `ABBA`
+執行 `updateRecords(recordCollection, 5439, "artist", "ABBA")` 後，`artist` 的值應該是字符串 `ABBA`。
 
 ```js
 assert(
@@ -38,7 +37,7 @@ assert(
 );
 ```
 
-After `updateRecords(recordCollection, 5439, "tracks", "Take a Chance on Me")`, `tracks` should have the string `Take a Chance on Me` as the last and only element.
+執行 `updateRecords(recordCollection, 5439, "tracks", "Take a Chance on Me")` 後，`tracks` 的最後一個和唯一一個元素應該爲字符串 `Take a Chance on Me`。
 
 ```js
 assert(
@@ -48,14 +47,14 @@ assert(
 );
 ```
 
-After `updateRecords(recordCollection, 2548, "artist", "")`, `artist` should not be set
+執行 `updateRecords(recordCollection, 2548, "artist", "")` 後，`artist` 不應被設置爲任何值。
 
 ```js
 updateRecords(_recordCollection, 2548, 'artist', '');
 assert(!_recordCollection[2548].hasOwnProperty('artist'));
 ```
 
-After `updateRecords(recordCollection, 1245, "tracks", "Addicted to Love")`, `tracks` should have the string `Addicted to Love` as the last element.
+執行 `updateRecords(recordCollection, 1245, "tracks", "Addicted to Love")` 後，`tracks` 的最後一個元素應該爲字符串 `Addicted to Love`。
 
 ```js
 assert(
@@ -65,7 +64,7 @@ assert(
 );
 ```
 
-After `updateRecords(recordCollection, 2468, "tracks", "Free")`, `tracks` should have the string `1999` as the first element.
+執行 `updateRecords(recordCollection, 2468, "tracks", "Free")` 後，`tracks` 的第一個元素應該爲字符串 `1999`。
 
 ```js
 assert(
@@ -75,14 +74,14 @@ assert(
 );
 ```
 
-After `updateRecords(recordCollection, 2548, "tracks", "")`, `tracks` should not be set
+執行 `updateRecords(recordCollection, 2548, "tracks", "")` 後，`tracks` 不應被設置爲任何值。
 
 ```js
 updateRecords(_recordCollection, 2548, 'tracks', '');
 assert(!_recordCollection[2548].hasOwnProperty('tracks'));
 ```
 
-After `updateRecords(recordCollection, 1245, "albumTitle", "Riptide")`, `albumTitle` should be the string `Riptide`
+執行 `updateRecords(recordCollection, 1245, "albumTitle", "Riptide")` 後，`albumTitle` 的值應該是字符串 `Riptide`。
 
 ```js
 assert(
diff --git a/curriculum/challenges/chinese-traditional/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.md b/curriculum/challenges/chinese-traditional/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.md
index 1bc786917d0..bf6b70f575b 100644
--- a/curriculum/challenges/chinese-traditional/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.md
+++ b/curriculum/challenges/chinese-traditional/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.md
@@ -11,13 +11,13 @@ dashedName: word-blanks
 
 給你一些不完整的句子，這些句子會缺少一些例如名詞、動詞、形容詞或者副詞之類的字詞。 然後你需要使用你選擇的詞語去填補這些缺失的地方，使得這個句子變得完整且有意義。
 
-Consider this sentence:
+考慮這句話：
 
 ```md
 It was really ____, and we ____ ourselves ____.
 ```
 
-This sentence has three missing pieces- an adjective, a verb and an adverb, and we can add words of our choice to complete it. We can then assign the completed sentence to a variable as follows:
+這句話有三個缺失的部分 - 形容詞、動詞和副詞，我們可以選擇合適單詞填入完成它。 然後將完成的句子賦值給變量，如下所示：
 
 ```js
 const sentence = "It was really " + "hot" + ", and we " + "laughed" + " ourselves " + "silly" + ".";
@@ -25,21 +25,21 @@ const sentence = "It was really " + "hot" + ", and we " + "laughed" + " ourselve
 
 # --instructions--
 
-In this challenge, we provide you with a noun, a verb, an adjective and an adverb. You need to form a complete sentence using words of your choice, along with the words we provide.
+在這個挑戰中，我們爲你提供名詞、動詞、形容詞和副詞。 你需要使用合適單詞以及我們提供的單詞來形成完整的句子。
 
-You will need to use the string concatenation operator `+` to build a new string, using the provided variables: `myNoun`, `myAdjective`, `myVerb`, and `myAdverb`. You will then assign the formed string to the `wordBlanks` variable. You should not change the words assigned to the variables.
+你需要使用字符串連接運算符 `+` 來拼接字符串變量：`myNoun`、`myAdjective`、`myVerb` 和 `myAdverb`，以構建一個新字符串。 然後，將新字符串賦給 `wordBlanks` 變量。 你不應該更改分配給變量的單詞。
 
-You will also need to account for spaces in your string, so that the final sentence has spaces between all the words. The result should be a complete sentence.
+你還需要考慮字符串中的空格，確保句子的所有單詞之間有空格。 結果應該是一個完整的句子。
 
 # --hints--
 
-`wordBlanks` should be a string.
+`wordBlanks` 應該是一個字符串。
 
 ```js
 assert(typeof wordBlanks === 'string');
 ```
 
-You should not change the values assigned to `myNoun`, `myVerb`, `myAdjective` or `myAdverb`.
+你不能改變賦給 `myNoun`、`myVerb`、`myAdjective` 或者 `myAdverb` 的值。
 
 ```js
 assert(
@@ -50,7 +50,7 @@ assert(
 );
 ```
 
-You should not directly use the values `dog`, `ran`, `big`, or `quickly` to create `wordBlanks`.
+你不應該直接使用 `dog`、`ran`、`big` 或 `quickly` 來創建 `wordBlanks`。
 
 ```js
 const newCode = removeAssignments(code);
@@ -62,7 +62,7 @@ assert(
 );
 ```
 
-`wordBlanks` should contain all of the words assigned to the variables `myNoun`, `myVerb`, `myAdjective` and `myAdverb` separated by non-word characters (and any additional words of your choice).
+`wordBlanks` 應該包含分配給變量 `myNoun`、`myVerb`、`myAdjective` 和 `myAdverb` 的所有單詞，用非單詞字符（和你選擇的任何其他單詞）分隔。
 
 ```js
 assert(
diff --git a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.md b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.md
index 30389f697e7..c230195a386 100644
--- a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.md
+++ b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.md
@@ -8,11 +8,11 @@ dashedName: add-attributes-to-the-circle-elements
 
 # --description--
 
-The last challenge created the `circle` elements for each point in the `dataset`, and appended them to the SVG. 但是 D3 需要更多關於位置和 `circle` 大小的信息來正確地顯示它們。
+上個挑戰爲 `dataset` 中的每個點都創建了 `circle` 元素，並將它們添加到 SVG 上。 但是 D3 需要更多關於位置和 `circle` 大小的信息來正確地顯示它們。
 
-在 SVG 中 `circle` 有三個主要的屬性。 `cx` 和 `cy` 屬性是座標。 They tell D3 where to position the *center* of the shape on the SVG. 半徑（ `r` 屬性）給出 `circle` 的大小。
+在 SVG 中 `circle` 有三個主要的屬性。 `cx` 和 `cy` 屬性是座標。 它們告訴 D3 將圖形的*中心*放在 SVG 的何處。 半徑（ `r` 屬性）給出 `circle` 的大小。
 
-Just like the `rect` `y` coordinate, the `cy` attribute for a `circle` is measured from the top of the SVG, not from the bottom.
+和 `rect` 的 `y` 座標一樣，`circle` 的 `cy` 屬性是從 SVG 畫布的頂端開始測量的，而不是從底端。
 
 所有的屬性都可以用回調函數來動態設值。 記住，所有串聯在 `data(dataset)` 後面的方法會爲 `dataset` 中的每個對象都運行一次。 回調函數中的 `d` 參數指在 `dataset` 中的當前對象，對每個點來說都是一個數組。 你可以使用方括號的方式，如 `d[0]`，來訪問數組中的值。
 
diff --git a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.md b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.md
index 0fbe053c333..cf95f1537a2 100644
--- a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.md
+++ b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.md
@@ -16,7 +16,7 @@ D3 有兩種方法來渲染 y 軸和 x 軸，分別是 `axisLeft()` 和 `axisBot
 const xAxis = d3.axisBottom(xScale);
 ```
 
-The next step is to render the axis on the SVG. 爲此，你可以使用一個 SVG 組件， `g` 元素， `g` 是英文中組（group）的縮寫。 不同於 `rect`、`circle`、`text`，在渲染時，軸只是一條直線。 因爲它是一個簡單的圖形，所以可以用 `g` 。 The last step is to apply a `transform` attribute to position the axis on the SVG in the right place. Otherwise, the line would render along the border of the SVG and wouldn't be visible. SVG 支持多種 `transforms`，但是定位軸需要使用 `translate` 屬性。 當它應用在 `g` 元素上時，它根據給出的總量移動整組。 下面是一個例子：
+下一步是在 SVG 上渲染 x 軸。 爲此，你可以使用一個 SVG 組件， `g` 元素， `g` 是英文中組（group）的縮寫。 不同於 `rect`、`circle`、`text`，在渲染時，軸只是一條直線。 因爲它是一個簡單的圖形，所以可以用 `g` 。 最後一步是使用 `transform` 屬性將軸放置在 SVG 的正確位置上。 否則，軸將會沿着 SVG 的邊緣渲染，從而不可見。 SVG 支持多種 `transforms`，但是定位軸需要使用 `translate` 屬性。 當它應用在 `g` 元素上時，它根據給出的總量移動整組。 下面是一個例子：
 
 ```js
 const xAxis = d3.axisBottom(xScale);
@@ -26,7 +26,7 @@ svg.append("g")
    .call(xAxis);
 ```
 
-The above code places the x-axis at the bottom of the SVG. 然後 x 軸作爲參數被傳遞給 `call()` 方法。 y 軸的定位也是這樣，只是 `translate` 參數的形式是 `(x, 0)`。 因爲 `translate` 是 `attr()` 方法中的一個字符串，你可以在參數中使用字符串的連接將變量值包括進去。
+上部分代碼將 x 軸放置在 SVG 的底端。 然後 x 軸作爲參數被傳遞給 `call()` 方法。 y 軸的定位也是這樣，只是 `translate` 參數的形式是 `(x, 0)`。 因爲 `translate` 是 `attr()` 方法中的一個字符串，你可以在參數中使用字符串的連接將變量值包括進去。
 
 # --instructions--
 
diff --git a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.md b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.md
index 539f1fdc0b4..1858af511b5 100644
--- a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.md
+++ b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.md
@@ -10,7 +10,7 @@ dashedName: add-labels-to-d3-elements
 
 D3 允許你使用 SVG 的 `text` 元素給圖形元素，如條形圖，添加標籤。
 
-Like the `rect` element, a `text` element needs to have `x` and `y` attributes, to place it on the SVG. 它也需要能夠獲取數據來顯示數據值。
+和 `rect` 元素類似，`text` 元素也需要 `x` 和 `y` 屬性來指定其放置在 SVG 上的位置， 它也需要能夠獲取數據來顯示數據值。
 
 D3 給了你很高的權限給圖形添加標籤。
 
diff --git a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.md b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.md
index 51178c78b95..ef5b846bf91 100644
--- a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.md
+++ b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.md
@@ -12,7 +12,7 @@ dashedName: add-labels-to-scatter-plot-circles
 
 目標是顯示 `dataset` 中每個對象的第一個（`x`）和第二個（`y`）字段中通過逗號分隔的值。
 
-The `text` nodes need `x` and `y` attributes to position it on the SVG. 在這個挑戰中，`y` 值（決定高度）可以用和 `circle` 的 `cy` 屬性相同的值， `x` 值可以比 `circle` 的 `cx` 值稍微大一些，這樣標籤纔可見， 並且被放置在散點的右邊。
+`text` 節點需要 `x` 和 `y` 屬性來指定放置在 SVG 中的位置。 在這個挑戰中，`y` 值（決定高度）可以用和 `circle` 的 `cy` 屬性相同的值， `x` 值可以比 `circle` 的 `cx` 值稍微大一些，這樣標籤纔可見， 並且被放置在散點的右邊。
 
 # --instructions--
 
diff --git a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.md b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.md
index 2542abcd83f..8e2c74225d0 100644
--- a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.md
+++ b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.md
@@ -1,6 +1,6 @@
 ---
 id: 587d7fab367417b2b2512bda
-title: 用 D3 創建線性比例
+title: 用 D3 創建線性比例尺
 challengeType: 6
 forumTopicId: 301483
 dashedName: create-a-linear-scale-with-d3
@@ -8,13 +8,13 @@ dashedName: create-a-linear-scale-with-d3
 
 # --description--
 
-The bar and scatter plot charts both plotted data directly onto the SVG. 但是，如果一組的高或者其中一個數據點比 SVG 的高或寬更大，它將跑到 SVG 區域外。
+條形圖和散點圖都直接在 SVG 上繪製數據。 但是，如果一組的高或者其中一個數據點比 SVG 的高或寬更大，它將跑到 SVG 區域外。
 
-D3 中，比例尺可幫助佈局數據。 `scales` are functions that tell the program how to map a set of raw data points onto the pixels of the SVG.
+在 D3 中，比例尺可幫助佈局數據。 `scales` 是函數，它告訴程序如何將一組原始數據點映射到 SVG 上。
 
-For example, say you have a 100x500-sized SVG and you want to plot Gross Domestic Product (GDP) for a number of countries. 這組數據將在十億美元或萬億美元的範圍內。 你給 D3 提供一種縮放方法，告訴它如何將大的 GDP 值放置在 100x500 大小的區域。
+例如，假設你有一個 100x500 大小的 SVG，你想爲許多國家繪製國內生產總值（GDP）的圖表。 這組數據將在十億美元或萬億美元的範圍內。 你給 D3 提供一種比例尺，告訴它如何將大的 GDP 值放置在 100x500 大小的區域。
 
-你不太可能按數據原本的大小來繪製圖表。 Before plotting it, you set the scale for your entire data set, so that the `x` and `y` values fit your SVG width and height.
+你不太可能按數據原本的大小來繪製圖表。 在繪製之前，你可以設置整個數據集的比例尺，以便 `x` 和 `y` 值適合你的 SVG 的寬度和高度。
 
 D3 有幾種縮放類型。 對於線性縮放（通常使用於定量數據），使用 D3 的 `scaleLinear()` 方法：
 
diff --git a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.md b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.md
index 299260f2398..93397778b24 100644
--- a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.md
+++ b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.md
@@ -14,7 +14,7 @@ SVG 用 `circle` 標籤來創建圓形。 它和之前用來構建條形圖的 `
 
 # --instructions--
 
-Use the `data()`, `enter()`, and `append()` methods to bind `dataset` to new `circle` elements that are appended to the SVG.
+使用 `data()`、`enter()`、`append()` 方法將 `dataset` 和添加到 SVG 的新 `circle` 元素綁定起來。
 
 **注意：** 圓形並不可見，因爲我們還沒有設置它們的屬性。 我們會在下一個挑戰中設置屬性。
 
diff --git a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.md b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.md
index 8c79f279d5d..0ddc98eed99 100644
--- a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.md
+++ b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.md
@@ -1,6 +1,6 @@
 ---
 id: 587d7fac367417b2b2512bdb
-title: 按比例設置域和範圍
+title: 設置比例尺的定義域和值域
 challengeType: 6
 forumTopicId: 301491
 dashedName: set-a-domain-and-a-range-on-a-scale
@@ -10,9 +10,9 @@ dashedName: set-a-domain-and-a-range-on-a-scale
 
 默認情況下，比例尺使用一對一關係（identity relationship）， 即輸入值直接映射爲輸出值。 但是比例尺可以更靈活更有趣。
 
-假設有一個數據集範圍爲 50 到 480， 這是縮放的輸入信息，也被稱爲<dfn>域</dfn>。
+假設有一個數據集值的範圍爲 50 到 480， 這是比例尺的輸入信息，也被稱爲<dfn>定義域</dfn>。
 
-You want to map those points along the `x` axis on the SVG, between 10 units and 500 units. 這是輸出信息，也被稱爲<dfn>範圍</dfn>。
+你想沿着 SVG 上的 `x` 軸映射這些點，在 10 單位和 500 單位之間。 這是輸出信息，也被稱爲<dfn>值域</dfn>。
 
 `domain()` 和 `range()` 方法設置比例尺的值， 它們都接受一個至少有兩個元素的數組作爲參數。 下面是一個例子：
 
@@ -28,11 +28,11 @@ d3.scaleLinear()
 
 按順序，將在控制檯中顯示以下值：`10`、`500`、`323.37` 和 `807.67`。
 
-注意，比例尺使用了域和範圍之間的線性關係來找出給定數字的輸出值。 域中的最小值（50）映射爲範圍中的最小值（10）。
+注意，比例尺使用了定義域和值域之間的線性關係來找出給定數字的輸出值。 定義域中的最小值（50）映射爲值域中的最小值（10）。
 
 # --instructions--
 
-創建一個比例尺，將它的域設置爲 `[250, 500]`，範圍設置爲 `[10, 150]`。
+創建一個比例尺，將它的定義域設置爲 `[250, 500]`，值域設置爲 `[10, 150]`。
 
 **注意：**你可以將 `domain()` 和 `range()` 方法串聯在 `scale` 變量後。
 
diff --git a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.md b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.md
index b55f5d545cb..d2811ad9b39 100644
--- a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.md
+++ b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.md
@@ -1,6 +1,6 @@
 ---
 id: 587d7fac367417b2b2512bde
-title: 使用預定義的比例放置元素
+title: 使用預定義的比例尺放置元素
 challengeType: 6
 forumTopicId: 301494
 dashedName: use-a-pre-defined-scale-to-place-elements
@@ -8,7 +8,7 @@ dashedName: use-a-pre-defined-scale-to-place-elements
 
 # --description--
 
-當比例尺建立好後，是時候重新映射散點圖了。 The scales are like processing functions that turn the `x` and `y` raw data into values that fit and render correctly on the SVG. 它們使數據在屏幕的佈局區域內部。
+當比例尺建立好後，是時候重新映射散點圖了。 比例尺就像操作函數一樣，將 `x` 和 `y` 的原數據值變爲適應 SVG 並可在 SVG 上正確渲染的值。 它們使數據在屏幕的佈局區域內部。
 
 用比例尺函數爲 SVG 圖形設置座標屬性值。 這包括 `rect` 或者 `text` 元素的 `x` 和 `y` 屬性，或者 `circles` 的 `cx` 和 `cy`。 以下是一個例子：
 
@@ -17,11 +17,11 @@ shape
   .attr("x", (d) => xScale(d[0]))
 ```
 
-Scales set shape coordinate attributes to place the data points onto the SVG. 當你顯示實際數據值時，不用使用比例尺，例如，在提示框或標籤中的 `text()` 方法。
+比例尺設置圖形座標屬性來將數據點放置在 SVG 上。 當你顯示實際數據值時，不用使用比例尺，例如，在提示框或標籤中的 `text()` 方法。
 
 # --instructions--
 
-Use `xScale` and `yScale` to position both the `circle` and `text` shapes onto the SVG. 對於 `circles`，使用比例尺設置 `cx` 和 `cy` 屬性， 半徑爲 `5` 個單位。
+使用 `xScale` 和 `yScale` 將 `circle` 和 `text` 圖形放置在 SVG 上。 對於 `circles`，使用比例尺設置 `cx` 和 `cy` 屬性， 半徑爲 `5` 個單位。
 
 對於 `text` 元素，使用比例尺設置 `x` 和 `y` 屬性。 標籤應該標註在點的右邊， 爲此，在將 `x` 數據值傳遞給 `xScale` 之前，要給它加上 `10` 個單位。
 
diff --git a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.md b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.md
index fc3df69ccd5..18e11bfbc5b 100644
--- a/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.md
+++ b/curriculum/challenges/chinese-traditional/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.md
@@ -1,6 +1,6 @@
 ---
 id: 587d7fac367417b2b2512bdd
-title: 使用動態比例
+title: 使用動態比例尺
 challengeType: 6
 forumTopicId: 301495
 dashedName: use-dynamic-scales
@@ -10,11 +10,11 @@ dashedName: use-dynamic-scales
 
 D3 的 `min()` 和 `max()` 方法在設置比例尺時十分有用。
 
-對於一個複雜的數據集，首要是設置比例尺，這樣可視化才能適合 SVG 容器的寬和高。 You want all the data plotted inside the SVG so it's visible on the web page.
+對於一個複雜的數據集，首要是設置比例尺，這樣可視化才能適合 SVG 容器的寬和高。 所有數據都應佈局在 SVG 內部，這樣它們在頁面上纔是可見的。
 
 下面這個例子爲散點圖設置了 x 軸的比例尺。 `domain()` 方法給比例尺傳遞關於散點圖原數據值的信息， `range()` 方法給出在頁面上進行可視化的實際空間信息。
 
-在這個例子中，domain 是從 0 到數據集中的最大值， 它使用 `max()` 方法和基於數組中 x 值的回調函數。 The range uses the SVG's width (`w`), but it includes some padding, too. This puts space between the scatter plot dots and the edge of the SVG.
+在這個例子中，定義域是從 0 到數據集中的最大值， 它使用 `max()` 方法和基於數組中 x 值的回調函數。 值域使用 SVG 畫布的寬（`w`），幷包含 padding， 這將在散點圖和 SVG 邊緣之間添加空隙。
 
 ```js
 const dataset = [
@@ -38,7 +38,7 @@ const xScale = d3.scaleLinear()
   .range([padding, w - padding]);
 ```
 
-在一開始可能很難理解 padding。 Picture the x-axis as a horizontal line from 0 to 500 (the width value for the SVG). 在 `range()` 方法中包含 padding 使散點圖沿着這條直線從 30 （而不是 0）開始，在 470 （而不是 500）結束。
+在一開始可能很難理解 padding。 想象 x 軸是一條從 0 到 500 （SVG 寬的值）的水平直線。 在 `range()` 方法中包含 padding 使散點圖沿着這條直線從 30 （而不是 0）開始，在 470 （而不是 500）結束。
 
 # --instructions--
 
diff --git a/curriculum/challenges/chinese-traditional/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md b/curriculum/challenges/chinese-traditional/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
index 00255ee50e1..cfaa85d7667 100644
--- a/curriculum/challenges/chinese-traditional/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
+++ b/curriculum/challenges/chinese-traditional/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
@@ -10,7 +10,7 @@ dashedName: post-data-with-the-javascript-xmlhttprequest-method
 
 在前面的示例中，你通過外部資源獲取數據。 此外，你也可以將數據發送到外部資源，只要該資源支持 AJAX 請求並且你知道 URL。
 
-JavaScript 的`XMLHttpRequest`方法也用於將數據發佈到服務器。 這是一個示例：
+JavaScript 的 `XMLHttpRequest` 方法也用於將數據發佈到服務器。 這是一個示例：
 
 ```js
 const xhr = new XMLHttpRequest();
@@ -26,33 +26,33 @@ const body = JSON.stringify({ userName: userName, suffix: ' loves cats!' });
 xhr.send(body);
 ```
 
-你之前已經見過這些方法。 Here the `open` method initializes the request as a `POST` to the given URL of the external resource, and passes `true` as the third parameter - indicating to perform the operation asynchronously.
+你之前已經見過這些方法。 在這裏，`open` 方法將請求初始化爲對外部資源的給定 URL 的 `POST`，並傳遞 `true` 作爲第三個參數——表示以異步方式執行該操作。
 
-The `setRequestHeader` method sets the value of an HTTP request header, which contains information about the sender and the request. It must be called after the `open` method, but before the `send` method. The two parameters are the name of the header and the value to set as the body of that header.
+`setRequestHeader` 方法設置了 HTTP 請求標頭的值，包含有關發送人和請求的信息。 它必須在 `open` 方法之後、`send` 方法之前調用。 這兩個參數是標頭的名稱和要設置爲該標頭正文的值。
 
-Next, the `onreadystatechange` event listener handles a change in the state of the request. A `readyState` of `4` means the operation is complete, and a `status` of `201` means it was a successful request. Therefore, the document's HTML can be updated.
+接下來，`onreadystatechange` 事件監聽器監聽請求狀態的更改。 `readyState` 爲 `4`，表示操作已完成。`status` 爲 `201`，表示請求成功。 因此，文檔的 HTML 可以更新。
 
-Finally, the `send` method sends the request with the `body` value. The `body` consists of a `userName` and a `suffix` key.
+最後， `send` 方法發送帶有 `body` 值的請求。 `body` 包含一個 `userName` 和一個 `suffix` 鍵。
 
 # --instructions--
 
-Update the code so it makes a `POST` request to the API endpoint. Then type your name in the input field and click `Send Message`. Your AJAX function should replace `Reply from Server will be here.` with data from the server. Format the response to display your name appended with the text `loves cats`.
+更新代碼，向 API 端點發送 `POST` 請求。 然後在輸入框中輸入你的姓名，並點擊 `Send Message`。 你的 AJAX 函數會用服務器返回的數據替換 `Reply from Server will be here.`。 修改返回的請求結果，在你的名字後面添加 `loves cats`。
 
 # --hints--
 
-Your code should create a new `XMLHttpRequest`.
+你的代碼應該創建一個新的 `XMLHttpRequest`。
 
 ```js
 assert(code.match(/new\s+?XMLHttpRequest\(\s*?\)/g));
 ```
 
-Your code should use the `open` method to initialize a `POST` request to the server.
+你的代碼應該使用 `open` 方法初始化一個發送給服務器的 `POST` 請求。
 
 ```js
 assert(code.match(/\.open\(\s*?('|")POST\1\s*?,\s*?url\s*?,\s*?true\s*?\)/g));
 ```
 
-Your code should use the `setRequestHeader` method.
+你的代碼應該使用 `setRequestHeader` 方法。
 
 ```js
 assert(
@@ -62,13 +62,13 @@ assert(
 );
 ```
 
-Your code should have an `onreadystatechange` event handler set to a function.
+你的代碼應該有一個設置爲函數的 `onreadystatechange` 事件處理程序。
 
 ```js
 assert(code.match(/\.onreadystatechange\s*?=/g));
 ```
 
-Your code should get the element with class `message` and change its `textContent` to `userName loves cats`
+你的代碼應該獲取 class 爲 `message` 的元素，並將它的 `textContent` 更改爲 `userName loves cats`。
 
 ```js
 assert(
@@ -78,7 +78,7 @@ assert(
 );
 ```
 
-Your code should use the `send` method.
+你的代碼應該使用 `send` 方法。
 
 ```js
 assert(code.match(/\.send\(\s*?body\s*?\)/g));
diff --git a/curriculum/challenges/chinese-traditional/05-back-end-development-and-apis/mongodb-and-mongoose/install-and-set-up-mongoose.md b/curriculum/challenges/chinese-traditional/05-back-end-development-and-apis/mongodb-and-mongoose/install-and-set-up-mongoose.md
index a675c00d9f8..ea9dc766dc0 100644
--- a/curriculum/challenges/chinese-traditional/05-back-end-development-and-apis/mongodb-and-mongoose/install-and-set-up-mongoose.md
+++ b/curriculum/challenges/chinese-traditional/05-back-end-development-and-apis/mongodb-and-mongoose/install-and-set-up-mongoose.md
@@ -32,7 +32,7 @@ dashedName: install-and-set-up-mongoose
 
 **注意：**如果你使用的是 Replit，則無法創建 `.env` 文件。 相反，使用內置的 <dfn>SECRETS</dfn> 選項卡來添加變量。 在使用 <em>SECRETS</em> 選項卡時，<em>不要</em>將值括在引號中。
 
-When you are done, connect to the database by calling the `connect` method within your `myApp.js` file by using the following syntax:
+完成後，使用以下語法在你的 `myApp.js` 文件中調用 `connect` 方法，連接到數據庫：
 
 ```js
 mongoose.connect(<Your URI>, { useNewUrlParser: true, useUnifiedTopology: true });
diff --git a/curriculum/challenges/chinese-traditional/06-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.md b/curriculum/challenges/chinese-traditional/06-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.md
index 09c519a4d6d..d4778338b2f 100644
--- a/curriculum/challenges/chinese-traditional/06-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.md
+++ b/curriculum/challenges/chinese-traditional/06-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.md
@@ -36,19 +36,19 @@ suite('GET /hello?name=[name] => "hello [name]"', function () {
 
 同時，請注意測試的回調函數中的 `done` 參數。 在測試結束時，調用它且不帶參數，是發出異步操作完成所必需的信號。
 
-Finally, note the `keepOpen` method just after the `request` method. Normally you would run your tests from the command line, or as part of an automated integration process, and you could let `chai-http` start and stop your server automatically.
+最後，請注意 `request` 方法後面的 `keepOpen` 方法。 通常，你會從命令行中運行你的測試，或者作爲自動集成過程的一部分，你可以讓 `chai-http` 自動啓動和停止你的服務器。
 
-However, the tests that run when you submit the link to your project require your server to be up, so you need to use the `keepOpen` method to prevent `chai-http` from stopping your server.
+然而，當你提交項目鏈接時運行的測試需要你的服務器是正常的，所以你需要使用 `keepOpen` 方法來防止 `chai-http` 停止你的服務器。
 
 # --instructions--
 
-Within `tests/2_functional-tests.js`, alter the `'Test GET /hello with no name'` test (`// #1`) to assert the `status` and the `text` of the response to make the test pass. Do not alter the arguments passed to the asserts.
+在 `tests/2_functional-tests.js` 中，修改 `'Test GET /hello with no name'` 測試（`// #1`），對響應的 `status` 和 `text` 使用斷言來通過測試。 不要改變傳遞給斷言的參數。
 
-There should be no URL query. Without a name URL query, the endpoint responds with `hello Guest`.
+不應該有任何 URL 查詢。 如果沒有名稱 URL 查詢，端點將使用 `hello Guest` 進行響應。
 
 # --hints--
 
-All tests should pass
+應通過所有測試。
 
 ```js
 (getUserInput) =>
@@ -62,7 +62,7 @@ All tests should pass
   );
 ```
 
-You should test for `res.status` == 200
+你應該測試 `res.status` == 200。
 
 ```js
 (getUserInput) =>
@@ -78,7 +78,7 @@ You should test for `res.status` == 200
   );
 ```
 
-You should test for `res.text` == `'hello Guest'`
+你應該測試 `res.text` == `'hello Guest'`。
 
 ```js
 (getUserInput) =>
diff --git a/curriculum/challenges/chinese-traditional/09-information-security/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.md b/curriculum/challenges/chinese-traditional/09-information-security/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.md
index 351e6e0b7f4..cfdd723ecf8 100644
--- a/curriculum/challenges/chinese-traditional/09-information-security/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.md
+++ b/curriculum/challenges/chinese-traditional/09-information-security/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.md
@@ -10,7 +10,7 @@ dashedName: mitigate-the-risk-of-clickjacking-with-helmet-frameguard
 
 請注意，本項目是在 <a href="https://replit.com/github/freeCodeCamp/boilerplate-infosec" target="_blank" rel="noopener noreferrer nofollow">Replit</a> 上的初始化項目的基礎上進行開發，你也可以從 <a href="https://github.com/freeCodeCamp/boilerplate-infosec/" target="_blank" rel="noopener noreferrer nofollow">GitHub</a> 上克隆。
 
-你的網頁可能在未經你同意的情況下被放在 `<frame>` 或 `<iframe>` 中。 這可能會導致點擊劫持攻擊等情況。 點擊劫持是一種欺騙用戶的技術，使其與用戶認爲不同的頁面進行互動。 This can be obtained by executing your page in a malicious context, by means of iframing. In that context, a hacker can put a hidden layer over your page. 隱藏的按鈕可以被用來運行壞的腳本。 該中間件設置 X-Frame-Options 頭。 它限制了誰可以把你的網站放在一個框架裏。 它有三種模式：DENY、SAMEORIGIN 和 ALLOW-FROM。
+你的網頁可能在未經你同意的情況下被放在 `<frame>` 或 `<iframe>` 中。 這可能會導致點擊劫持攻擊等情況。 點擊劫持是一種欺騙用戶的技術，使其與用戶認爲不同的頁面進行互動。 這可以通過使用 iframe 惡意運行你的頁面而獲得。 在這種情況下，黑客可以在你的頁面上設置一個隱藏層。 隱藏的按鈕可以被用來運行壞的腳本。 該中間件設置 X-Frame-Options 頭。 它限制了誰可以把你的網站放在一個框架裏。 它有三種模式：DENY、SAMEORIGIN 和 ALLOW-FROM。
 
 我們不需要讓我們的應用程序可以被嵌入。
 
diff --git a/curriculum/challenges/chinese-traditional/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md b/curriculum/challenges/chinese-traditional/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
index 70b1641b885..a5f81aff693 100644
--- a/curriculum/challenges/chinese-traditional/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
+++ b/curriculum/challenges/chinese-traditional/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
@@ -35,6 +35,12 @@ assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(ru
 assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].some(css => css?.keyText === '40%'));
 ```
 
+You should have 4 waypoints in your keyframe.
+
+```js
+assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].length === 4);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/chinese-traditional/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md b/curriculum/challenges/chinese-traditional/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md
index 5a53c50f3a3..67ebd5e1b63 100644
--- a/curriculum/challenges/chinese-traditional/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md
+++ b/curriculum/challenges/chinese-traditional/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md
@@ -1,15 +1,15 @@
 ---
 id: 63d8402e39c73468b059cd43
-title: "Build a Data Graph Explorer"
+title: "創建一個數據圖表瀏覽器"
 challengeType: 10
 dashedName: build-a-data-graph-explorer
 ---
 
 # --description--
 
-You will be <a href="https://colab.research.google.com/#create=true" target="_blank" rel="noopener noreferrer nofollow">working on this project with Google Colaboratory</a>.
+你將使用 <a href="https://colab.research.google.com/#create=true" target="_blank" rel="noopener noreferrer nofollow">Google Colaboratory</a> 來完成這個項目。
 
-After going to that link, create a copy of the notebook either in your own account or locally. Once you complete the project and it passes the test (included at that link), submit your project link below. If you are submitting a Google Colaboratory link, make sure to turn on link sharing for "anyone with the link."
+進入該鏈接後，在你自己的賬戶或本地創建一個筆記本的副本。 Once you complete the project and it passes the test (included at that link), submit your project link below. If you are submitting a Google Colaboratory link, make sure to turn on link sharing for "anyone with the link."
 
 # --instructions--
 
diff --git a/curriculum/challenges/chinese/00-certifications/college-algebra-with-python-certification/college-algebra-with-python-certification.yml b/curriculum/challenges/chinese/00-certifications/college-algebra-with-python-certification/college-algebra-with-python-certification.yml
index 6eb47d8247c..97c7a0b508e 100644
--- a/curriculum/challenges/chinese/00-certifications/college-algebra-with-python-certification/college-algebra-with-python-certification.yml
+++ b/curriculum/challenges/chinese/00-certifications/college-algebra-with-python-certification/college-algebra-with-python-certification.yml
@@ -7,16 +7,16 @@ isPrivate: true
 tests:
   - 
     id: 63d83ff239c73468b059cd3f
-    title: Build a Multi-Function Calculator
+    title: 创建一个多功能计算器
   - 
     id: 63d83ffd39c73468b059cd40
-    title: Build a Graphing Calculator
+    title: 创建一个图形计算器
   - 
     id: 63d8401039c73468b059cd41
-    title: Build Three Math Games
+    title: 创建三个数学游戏
   - 
     id: 63d8401e39c73468b059cd42
-    title: Build a Financial Calculator
+    title: 创建一个财务计算器
   - 
     id: 63d8402e39c73468b059cd43
-    title: Build a Data Graph Explorer
+    title: 创建一个数据图表浏览器
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
index d6d8d353a05..15724922cc3 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
@@ -8,28 +8,27 @@ dashedName: record-collection
 
 # --description--
 
-You are creating a function that aids in the maintenance of a musical album collection. The collection is organized as an object that contains multiple albums which are also objects. Each album is represented in the collection with a unique `id` as the property name. Within each album object, there are various properties describing information about the album. Not all albums have complete information.
+你将创建一个帮助维护音乐专辑集的函数。 这个集合是一个包含多个相册的对象，这些相册也是对象。 每张专辑在集合中以唯一的 `id` 作为属性名来表示。 在每个专辑对象中，有各种描述专辑信息的属性。 并非所有专辑都有完整的信息。
 
-The `updateRecords` function takes 4 arguments represented by the following function parameters:
+`updateRecords` 函数有 4 个参数，即以下参数：
 
--   `records` - an object containing several individual albums
--   `id` - a number representing a specific album in the `records` object
--   `prop` - a string representing the name of the album’s property to update
--   `value` - a string containing the information used to update the album’s property
+-   `records` - 一个包含多个专辑的对象
+-   `id` - 一个数字，代表 `records` 对象中特定的专辑
+-   `prop` - 一个字符串，代表相册属性名称
+-   `value` - 一个字符串，包含用来更新相册属性的信息
 
-Complete the function using the rules below to modify the object passed to the function.
+使用下面的规则完成函数来修改传递给函数的对象。
 
--   Your function must always return the entire `records` object.
--   If `value` is an empty string, delete the given `prop` property from the album.
--   If `prop` isn’t `"tracks"` and `value` isn't an empty string, assign the `value` to that album’s `prop`.
--   If `prop` is `"tracks"` and `value` isn’t an empty string, add the `value` to the end of the album’s existing `"tracks"` array.
--   If the album doesn’t have a `"tracks"` property, create a new array for the album's `"tracks"` property before adding the `value` to it.
+-   你的函数必须始终返回整个 `records` 对象。
+-   如果 `value` 是空字符串，从专辑里删除指定的 `prop`。
+-   If `prop` isn't `tracks` and `value` isn't an empty string, assign the `value` to that album's `prop`.
+-   If `prop` is `tracks` and value isn't an empty string, add the `value` to the end of the album's `tracks` array. You need to create this array first if the album does not have a `tracks` property.
 
-**Note:** A copy of the `recordCollection` object is used for the tests. You should not directly modify the `recordCollection` object.
+**注意：** 将 `recordCollection` 对象的副本用于测试。 你不应该直接修改 `recordCollection` 对象。
 
 # --hints--
 
-After `updateRecords(recordCollection, 5439, "artist", "ABBA")`, `artist` should be the string `ABBA`
+执行 `updateRecords(recordCollection, 5439, "artist", "ABBA")` 后，`artist` 的值应该是字符串 `ABBA`。
 
 ```js
 assert(
@@ -38,7 +37,7 @@ assert(
 );
 ```
 
-After `updateRecords(recordCollection, 5439, "tracks", "Take a Chance on Me")`, `tracks` should have the string `Take a Chance on Me` as the last and only element.
+执行 `updateRecords(recordCollection, 5439, "tracks", "Take a Chance on Me")` 后，`tracks` 的最后一个和唯一一个元素应该为字符串 `Take a Chance on Me`。
 
 ```js
 assert(
@@ -48,14 +47,14 @@ assert(
 );
 ```
 
-After `updateRecords(recordCollection, 2548, "artist", "")`, `artist` should not be set
+执行 `updateRecords(recordCollection, 2548, "artist", "")` 后，`artist` 不应被设置为任何值。
 
 ```js
 updateRecords(_recordCollection, 2548, 'artist', '');
 assert(!_recordCollection[2548].hasOwnProperty('artist'));
 ```
 
-After `updateRecords(recordCollection, 1245, "tracks", "Addicted to Love")`, `tracks` should have the string `Addicted to Love` as the last element.
+执行 `updateRecords(recordCollection, 1245, "tracks", "Addicted to Love")` 后，`tracks` 的最后一个元素应该为字符串 `Addicted to Love`。
 
 ```js
 assert(
@@ -65,7 +64,7 @@ assert(
 );
 ```
 
-After `updateRecords(recordCollection, 2468, "tracks", "Free")`, `tracks` should have the string `1999` as the first element.
+执行 `updateRecords(recordCollection, 2468, "tracks", "Free")` 后，`tracks` 的第一个元素应该为字符串 `1999`。
 
 ```js
 assert(
@@ -75,14 +74,14 @@ assert(
 );
 ```
 
-After `updateRecords(recordCollection, 2548, "tracks", "")`, `tracks` should not be set
+执行 `updateRecords(recordCollection, 2548, "tracks", "")` 后，`tracks` 不应被设置为任何值。
 
 ```js
 updateRecords(_recordCollection, 2548, 'tracks', '');
 assert(!_recordCollection[2548].hasOwnProperty('tracks'));
 ```
 
-After `updateRecords(recordCollection, 1245, "albumTitle", "Riptide")`, `albumTitle` should be the string `Riptide`
+执行 `updateRecords(recordCollection, 1245, "albumTitle", "Riptide")` 后，`albumTitle` 的值应该是字符串 `Riptide`。
 
 ```js
 assert(
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.md
index 9d96a20a290..3f2cc8f93d4 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.md
@@ -11,13 +11,13 @@ dashedName: word-blanks
 
 给你一些不完整的句子，这些句子会缺少一些例如名词、动词、形容词或者副词之类的字词。 然后你需要使用你选择的词语去填补这些缺失的地方，使得这个句子变得完整且有意义。
 
-Consider this sentence:
+考虑这句话：
 
 ```md
 It was really ____, and we ____ ourselves ____.
 ```
 
-This sentence has three missing pieces- an adjective, a verb and an adverb, and we can add words of our choice to complete it. We can then assign the completed sentence to a variable as follows:
+这句话有三个缺失的部分 - 形容词、动词和副词，我们可以选择合适单词填入完成它。 然后将完成的句子赋值给变量，如下所示：
 
 ```js
 const sentence = "It was really " + "hot" + ", and we " + "laughed" + " ourselves " + "silly" + ".";
@@ -25,21 +25,21 @@ const sentence = "It was really " + "hot" + ", and we " + "laughed" + " ourselve
 
 # --instructions--
 
-In this challenge, we provide you with a noun, a verb, an adjective and an adverb. You need to form a complete sentence using words of your choice, along with the words we provide.
+在这个挑战中，我们为你提供名词、动词、形容词和副词。 你需要使用合适单词以及我们提供的单词来形成完整的句子。
 
-You will need to use the string concatenation operator `+` to build a new string, using the provided variables: `myNoun`, `myAdjective`, `myVerb`, and `myAdverb`. You will then assign the formed string to the `wordBlanks` variable. You should not change the words assigned to the variables.
+你需要使用字符串连接运算符 `+` 来拼接字符串变量：`myNoun`、`myAdjective`、`myVerb` 和 `myAdverb`，以构建一个新字符串。 然后，将新字符串赋给 `wordBlanks` 变量。 你不应该更改分配给变量的单词。
 
-You will also need to account for spaces in your string, so that the final sentence has spaces between all the words. The result should be a complete sentence.
+你还需要考虑字符串中的空格，确保句子的所有单词之间有空格。 结果应该是一个完整的句子。
 
 # --hints--
 
-`wordBlanks` should be a string.
+`wordBlanks` 应该是一个字符串。
 
 ```js
 assert(typeof wordBlanks === 'string');
 ```
 
-You should not change the values assigned to `myNoun`, `myVerb`, `myAdjective` or `myAdverb`.
+你不能改变赋给 `myNoun`、`myVerb`、`myAdjective` 或者 `myAdverb` 的值。
 
 ```js
 assert(
@@ -50,7 +50,7 @@ assert(
 );
 ```
 
-You should not directly use the values `dog`, `ran`, `big`, or `quickly` to create `wordBlanks`.
+你不应该直接使用 `dog`、`ran`、`big` 或 `quickly` 来创建 `wordBlanks`。
 
 ```js
 const newCode = removeAssignments(code);
@@ -62,7 +62,7 @@ assert(
 );
 ```
 
-`wordBlanks` should contain all of the words assigned to the variables `myNoun`, `myVerb`, `myAdjective` and `myAdverb` separated by non-word characters (and any additional words of your choice).
+`wordBlanks` 应该包含分配给变量 `myNoun`、`myVerb`、`myAdjective` 和 `myAdverb` 的所有单词，用非单词字符（和你选择的任何其他单词）分隔。
 
 ```js
 assert(
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.md
index f0d0f23f974..4616543bf38 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.md
@@ -8,11 +8,11 @@ dashedName: add-attributes-to-the-circle-elements
 
 # --description--
 
-The last challenge created the `circle` elements for each point in the `dataset`, and appended them to the SVG. 但是 D3 需要更多关于位置和 `circle` 大小的信息来正确地显示它们。
+上个挑战为 `dataset` 中的每个点都创建了 `circle` 元素，并将它们添加到 SVG 上。 但是 D3 需要更多关于位置和 `circle` 大小的信息来正确地显示它们。
 
-在 SVG 中 `circle` 有三个主要的属性。 `cx` 和 `cy` 属性是坐标。 They tell D3 where to position the *center* of the shape on the SVG. 半径（ `r` 属性）给出 `circle` 的大小。
+在 SVG 中 `circle` 有三个主要的属性。 `cx` 和 `cy` 属性是坐标。 它们告诉 D3 将图形的*中心*放在 SVG 的何处。 半径（ `r` 属性）给出 `circle` 的大小。
 
-Just like the `rect` `y` coordinate, the `cy` attribute for a `circle` is measured from the top of the SVG, not from the bottom.
+和 `rect` 的 `y` 坐标一样，`circle` 的 `cy` 属性是从 SVG 画布的顶端开始测量的，而不是从底端。
 
 所有的属性都可以用回调函数来动态设值。 记住，所有串联在 `data(dataset)` 后面的方法会为 `dataset` 中的每个对象都运行一次。 回调函数中的 `d` 参数指在 `dataset` 中的当前对象，对每个点来说都是一个数组。 你可以使用方括号的方式，如 `d[0]`，来访问数组中的值。
 
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.md
index 015392274f2..524ca1f747d 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.md
@@ -16,7 +16,7 @@ D3 有两种方法来渲染 y 轴和 x 轴，分别是 `axisLeft()` 和 `axisBot
 const xAxis = d3.axisBottom(xScale);
 ```
 
-The next step is to render the axis on the SVG. 为此，你可以使用一个 SVG 组件， `g` 元素， `g` 是英文中组（group）的缩写。 不同于 `rect`、`circle`、`text`，在渲染时，轴只是一条直线。 因为它是一个简单的图形，所以可以用 `g` 。 The last step is to apply a `transform` attribute to position the axis on the SVG in the right place. Otherwise, the line would render along the border of the SVG and wouldn't be visible. SVG 支持多种 `transforms`，但是定位轴需要使用 `translate` 属性。 当它应用在 `g` 元素上时，它根据给出的总量移动整组。 下面是一个例子：
+下一步是在 SVG 上渲染 x 轴。 为此，你可以使用一个 SVG 组件， `g` 元素， `g` 是英文中组（group）的缩写。 不同于 `rect`、`circle`、`text`，在渲染时，轴只是一条直线。 因为它是一个简单的图形，所以可以用 `g` 。 最后一步是使用 `transform` 属性将轴放置在 SVG 的正确位置上。 否则，轴将会沿着 SVG 的边缘渲染，从而不可见。 SVG 支持多种 `transforms`，但是定位轴需要使用 `translate` 属性。 当它应用在 `g` 元素上时，它根据给出的总量移动整组。 下面是一个例子：
 
 ```js
 const xAxis = d3.axisBottom(xScale);
@@ -26,7 +26,7 @@ svg.append("g")
    .call(xAxis);
 ```
 
-The above code places the x-axis at the bottom of the SVG. 然后 x 轴作为参数被传递给 `call()` 方法。 y 轴的定位也是这样，只是 `translate` 参数的形式是 `(x, 0)`。 因为 `translate` 是 `attr()` 方法中的一个字符串，你可以在参数中使用字符串的连接将变量值包括进去。
+上部分代码将 x 轴放置在 SVG 的底端。 然后 x 轴作为参数被传递给 `call()` 方法。 y 轴的定位也是这样，只是 `translate` 参数的形式是 `(x, 0)`。 因为 `translate` 是 `attr()` 方法中的一个字符串，你可以在参数中使用字符串的连接将变量值包括进去。
 
 # --instructions--
 
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.md
index 0892a713805..44bea31dafc 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.md
@@ -10,7 +10,7 @@ dashedName: add-labels-to-d3-elements
 
 D3 允许你使用 SVG 的 `text` 元素给图形元素，如条形图，添加标签。
 
-Like the `rect` element, a `text` element needs to have `x` and `y` attributes, to place it on the SVG. 它也需要能够获取数据来显示数据值。
+和 `rect` 元素类似，`text` 元素也需要 `x` 和 `y` 属性来指定其放置在 SVG 上的位置， 它也需要能够获取数据来显示数据值。
 
 D3 给了你很高的权限给图形添加标签。
 
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.md
index 2eb84bbba52..e8b313051ed 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.md
@@ -12,7 +12,7 @@ dashedName: add-labels-to-scatter-plot-circles
 
 目标是显示 `dataset` 中每个对象的第一个（`x`）和第二个（`y`）字段中通过逗号分隔的值。
 
-The `text` nodes need `x` and `y` attributes to position it on the SVG. 在这个挑战中，`y` 值（决定高度）可以用和 `circle` 的 `cy` 属性相同的值， `x` 值可以比 `circle` 的 `cx` 值稍微大一些，这样标签才可见， 并且被放置在散点的右边。
+`text` 节点需要 `x` 和 `y` 属性来指定放置在 SVG 中的位置。 在这个挑战中，`y` 值（决定高度）可以用和 `circle` 的 `cy` 属性相同的值， `x` 值可以比 `circle` 的 `cx` 值稍微大一些，这样标签才可见， 并且被放置在散点的右边。
 
 # --instructions--
 
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.md
index 7e328c156e0..1dc138331e8 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.md
@@ -1,6 +1,6 @@
 ---
 id: 587d7fab367417b2b2512bda
-title: 用 D3 创建线性比例
+title: 用 D3 创建线性比例尺
 challengeType: 6
 forumTopicId: 301483
 dashedName: create-a-linear-scale-with-d3
@@ -8,13 +8,13 @@ dashedName: create-a-linear-scale-with-d3
 
 # --description--
 
-The bar and scatter plot charts both plotted data directly onto the SVG. 但是，如果一组的高或者其中一个数据点比 SVG 的高或宽更大，它将跑到 SVG 区域外。
+条形图和散点图都直接在 SVG 上绘制数据。 但是，如果一组的高或者其中一个数据点比 SVG 的高或宽更大，它将跑到 SVG 区域外。
 
-D3 中，比例尺可帮助布局数据。 `scales` are functions that tell the program how to map a set of raw data points onto the pixels of the SVG.
+在 D3 中，比例尺可帮助布局数据。 `scales` 是函数，它告诉程序如何将一组原始数据点映射到 SVG 上。
 
-For example, say you have a 100x500-sized SVG and you want to plot Gross Domestic Product (GDP) for a number of countries. 这组数据将在十亿美元或万亿美元的范围内。 你给 D3 提供一种缩放方法，告诉它如何将大的 GDP 值放置在 100x500 大小的区域。
+例如，假设你有一个 100x500 大小的 SVG，你想为许多国家绘制国内生产总值（GDP）的图表。 这组数据将在十亿美元或万亿美元的范围内。 你给 D3 提供一种比例尺，告诉它如何将大的 GDP 值放置在 100x500 大小的区域。
 
-你不太可能按数据原本的大小来绘制图表。 Before plotting it, you set the scale for your entire data set, so that the `x` and `y` values fit your SVG width and height.
+你不太可能按数据原本的大小来绘制图表。 在绘制之前，你可以设置整个数据集的比例尺，以便 `x` 和 `y` 值适合你的 SVG 的宽度和高度。
 
 D3 有几种缩放类型。 对于线性缩放（通常使用于定量数据），使用 D3 的 `scaleLinear()` 方法：
 
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.md
index 6f3a7123e13..8f1c657c3ea 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.md
@@ -14,7 +14,7 @@ SVG 用 `circle` 标签来创建圆形。 它和之前用来构建条形图的 `
 
 # --instructions--
 
-Use the `data()`, `enter()`, and `append()` methods to bind `dataset` to new `circle` elements that are appended to the SVG.
+使用 `data()`、`enter()`、`append()` 方法将 `dataset` 和添加到 SVG 的新 `circle` 元素绑定起来。
 
 **注意：** 圆形并不可见，因为我们还没有设置它们的属性。 我们会在下一个挑战中设置属性。
 
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.md
index a2c247a6953..79aa3021f1b 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.md
@@ -1,6 +1,6 @@
 ---
 id: 587d7fac367417b2b2512bdb
-title: 按比例设置域和范围
+title: 设置比例尺的定义域和值域
 challengeType: 6
 forumTopicId: 301491
 dashedName: set-a-domain-and-a-range-on-a-scale
@@ -10,9 +10,9 @@ dashedName: set-a-domain-and-a-range-on-a-scale
 
 默认情况下，比例尺使用一对一关系（identity relationship）， 即输入值直接映射为输出值。 但是比例尺可以更灵活更有趣。
 
-假设有一个数据集范围为 50 到 480， 这是缩放的输入信息，也被称为<dfn>域</dfn>。
+假设有一个数据集值的范围为 50 到 480， 这是比例尺的输入信息，也被称为<dfn>定义域</dfn>。
 
-You want to map those points along the `x` axis on the SVG, between 10 units and 500 units. 这是输出信息，也被称为<dfn>范围</dfn>。
+你想沿着 SVG 上的 `x` 轴映射这些点，在 10 单位和 500 单位之间。 这是输出信息，也被称为<dfn>值域</dfn>。
 
 `domain()` 和 `range()` 方法设置比例尺的值， 它们都接受一个至少有两个元素的数组作为参数。 下面是一个例子：
 
@@ -28,11 +28,11 @@ d3.scaleLinear()
 
 按顺序，将在控制台中显示以下值：`10`、`500`、`323.37` 和 `807.67`。
 
-注意，比例尺使用了域和范围之间的线性关系来找出给定数字的输出值。 域中的最小值（50）映射为范围中的最小值（10）。
+注意，比例尺使用了定义域和值域之间的线性关系来找出给定数字的输出值。 定义域中的最小值（50）映射为值域中的最小值（10）。
 
 # --instructions--
 
-创建一个比例尺，将它的域设置为 `[250, 500]`，范围设置为 `[10, 150]`。
+创建一个比例尺，将它的定义域设置为 `[250, 500]`，值域设置为 `[10, 150]`。
 
 **注意：**你可以将 `domain()` 和 `range()` 方法串联在 `scale` 变量后。
 
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.md
index 63e8ebd2a67..b28d5fe48b9 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.md
@@ -1,6 +1,6 @@
 ---
 id: 587d7fac367417b2b2512bde
-title: 使用预定义的比例放置元素
+title: 使用预定义的比例尺放置元素
 challengeType: 6
 forumTopicId: 301494
 dashedName: use-a-pre-defined-scale-to-place-elements
@@ -8,7 +8,7 @@ dashedName: use-a-pre-defined-scale-to-place-elements
 
 # --description--
 
-当比例尺建立好后，是时候重新映射散点图了。 The scales are like processing functions that turn the `x` and `y` raw data into values that fit and render correctly on the SVG. 它们使数据在屏幕的布局区域内部。
+当比例尺建立好后，是时候重新映射散点图了。 比例尺就像操作函数一样，将 `x` 和 `y` 的原数据值变为适应 SVG 并可在 SVG 上正确渲染的值。 它们使数据在屏幕的布局区域内部。
 
 用比例尺函数为 SVG 图形设置坐标属性值。 这包括 `rect` 或者 `text` 元素的 `x` 和 `y` 属性，或者 `circles` 的 `cx` 和 `cy`。 以下是一个例子：
 
@@ -17,11 +17,11 @@ shape
   .attr("x", (d) => xScale(d[0]))
 ```
 
-Scales set shape coordinate attributes to place the data points onto the SVG. 当你显示实际数据值时，不用使用比例尺，例如，在提示框或标签中的 `text()` 方法。
+比例尺设置图形坐标属性来将数据点放置在 SVG 上。 当你显示实际数据值时，不用使用比例尺，例如，在提示框或标签中的 `text()` 方法。
 
 # --instructions--
 
-Use `xScale` and `yScale` to position both the `circle` and `text` shapes onto the SVG. 对于 `circles`，使用比例尺设置 `cx` 和 `cy` 属性， 半径为 `5` 个单位。
+使用 `xScale` 和 `yScale` 将 `circle` 和 `text` 图形放置在 SVG 上。 对于 `circles`，使用比例尺设置 `cx` 和 `cy` 属性， 半径为 `5` 个单位。
 
 对于 `text` 元素，使用比例尺设置 `x` 和 `y` 属性。 标签应该标注在点的右边， 为此，在将 `x` 数据值传递给 `xScale` 之前，要给它加上 `10` 个单位。
 
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.md
index 6c0564c3806..8a5de339269 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.md
@@ -1,6 +1,6 @@
 ---
 id: 587d7fac367417b2b2512bdd
-title: 使用动态比例
+title: 使用动态比例尺
 challengeType: 6
 forumTopicId: 301495
 dashedName: use-dynamic-scales
@@ -10,11 +10,11 @@ dashedName: use-dynamic-scales
 
 D3 的 `min()` 和 `max()` 方法在设置比例尺时十分有用。
 
-对于一个复杂的数据集，首要是设置比例尺，这样可视化才能适合 SVG 容器的宽和高。 You want all the data plotted inside the SVG so it's visible on the web page.
+对于一个复杂的数据集，首要是设置比例尺，这样可视化才能适合 SVG 容器的宽和高。 所有数据都应布局在 SVG 内部，这样它们在页面上才是可见的。
 
 下面这个例子为散点图设置了 x 轴的比例尺。 `domain()` 方法给比例尺传递关于散点图原数据值的信息， `range()` 方法给出在页面上进行可视化的实际空间信息。
 
-在这个例子中，domain 是从 0 到数据集中的最大值， 它使用 `max()` 方法和基于数组中 x 值的回调函数。 The range uses the SVG's width (`w`), but it includes some padding, too. This puts space between the scatter plot dots and the edge of the SVG.
+在这个例子中，定义域是从 0 到数据集中的最大值， 它使用 `max()` 方法和基于数组中 x 值的回调函数。 值域使用 SVG 画布的宽（`w`），并包含 padding， 这将在散点图和 SVG 边缘之间添加空隙。
 
 ```js
 const dataset = [
@@ -38,7 +38,7 @@ const xScale = d3.scaleLinear()
   .range([padding, w - padding]);
 ```
 
-在一开始可能很难理解 padding。 Picture the x-axis as a horizontal line from 0 to 500 (the width value for the SVG). 在 `range()` 方法中包含 padding 使散点图沿着这条直线从 30 （而不是 0）开始，在 470 （而不是 500）结束。
+在一开始可能很难理解 padding。 想象 x 轴是一条从 0 到 500 （SVG 宽的值）的水平直线。 在 `range()` 方法中包含 padding 使散点图沿着这条直线从 30 （而不是 0）开始，在 470 （而不是 500）结束。
 
 # --instructions--
 
diff --git a/curriculum/challenges/chinese/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md b/curriculum/challenges/chinese/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
index 7361fa2cdc6..bf625013365 100644
--- a/curriculum/challenges/chinese/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
+++ b/curriculum/challenges/chinese/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
@@ -10,7 +10,7 @@ dashedName: post-data-with-the-javascript-xmlhttprequest-method
 
 在前面的示例中，你通过外部资源获取数据。 此外，你也可以将数据发送到外部资源，只要该资源支持 AJAX 请求并且你知道 URL。
 
-JavaScript 的`XMLHttpRequest`方法也用于将数据发布到服务器。 这是一个示例：
+JavaScript 的 `XMLHttpRequest` 方法也用于将数据发布到服务器。 这是一个示例：
 
 ```js
 const xhr = new XMLHttpRequest();
@@ -26,33 +26,33 @@ const body = JSON.stringify({ userName: userName, suffix: ' loves cats!' });
 xhr.send(body);
 ```
 
-你之前已经见过这些方法。 Here the `open` method initializes the request as a `POST` to the given URL of the external resource, and passes `true` as the third parameter - indicating to perform the operation asynchronously.
+你之前已经见过这些方法。 在这里，`open` 方法将请求初始化为对外部资源的给定 URL 的 `POST`，并传递 `true` 作为第三个参数——表示以异步方式执行该操作。
 
-The `setRequestHeader` method sets the value of an HTTP request header, which contains information about the sender and the request. It must be called after the `open` method, but before the `send` method. The two parameters are the name of the header and the value to set as the body of that header.
+`setRequestHeader` 方法设置了 HTTP 请求标头的值，包含有关发送人和请求的信息。 它必须在 `open` 方法之后、`send` 方法之前调用。 这两个参数是标头的名称和要设置为该标头正文的值。
 
-Next, the `onreadystatechange` event listener handles a change in the state of the request. A `readyState` of `4` means the operation is complete, and a `status` of `201` means it was a successful request. Therefore, the document's HTML can be updated.
+接下来，`onreadystatechange` 事件监听器监听请求状态的更改。 `readyState` 为 `4`，表示操作已完成。`status` 为 `201`，表示请求成功。 因此，文档的 HTML 可以更新。
 
-Finally, the `send` method sends the request with the `body` value. The `body` consists of a `userName` and a `suffix` key.
+最后， `send` 方法发送带有 `body` 值的请求。 `body` 包含一个 `userName` 和一个 `suffix` 键。
 
 # --instructions--
 
-Update the code so it makes a `POST` request to the API endpoint. Then type your name in the input field and click `Send Message`. Your AJAX function should replace `Reply from Server will be here.` with data from the server. Format the response to display your name appended with the text `loves cats`.
+更新代码，向 API 端点发送 `POST` 请求。 然后在输入框中输入你的姓名，并点击 `Send Message`。 你的 AJAX 函数会用服务器返回的数据替换 `Reply from Server will be here.`。 修改返回的请求结果，在你的名字后面添加 `loves cats`。
 
 # --hints--
 
-Your code should create a new `XMLHttpRequest`.
+你的代码应该创建一个新的 `XMLHttpRequest`。
 
 ```js
 assert(code.match(/new\s+?XMLHttpRequest\(\s*?\)/g));
 ```
 
-Your code should use the `open` method to initialize a `POST` request to the server.
+你的代码应该使用 `open` 方法初始化一个发送给服务器的 `POST` 请求。
 
 ```js
 assert(code.match(/\.open\(\s*?('|")POST\1\s*?,\s*?url\s*?,\s*?true\s*?\)/g));
 ```
 
-Your code should use the `setRequestHeader` method.
+你的代码应该使用 `setRequestHeader` 方法。
 
 ```js
 assert(
@@ -62,13 +62,13 @@ assert(
 );
 ```
 
-Your code should have an `onreadystatechange` event handler set to a function.
+你的代码应该有一个设置为函数的 `onreadystatechange` 事件处理程序。
 
 ```js
 assert(code.match(/\.onreadystatechange\s*?=/g));
 ```
 
-Your code should get the element with class `message` and change its `textContent` to `userName loves cats`
+你的代码应该获取 class 为 `message` 的元素，并将它的 `textContent` 更改为 `userName loves cats`。
 
 ```js
 assert(
@@ -78,7 +78,7 @@ assert(
 );
 ```
 
-Your code should use the `send` method.
+你的代码应该使用 `send` 方法。
 
 ```js
 assert(code.match(/\.send\(\s*?body\s*?\)/g));
diff --git a/curriculum/challenges/chinese/05-back-end-development-and-apis/mongodb-and-mongoose/install-and-set-up-mongoose.md b/curriculum/challenges/chinese/05-back-end-development-and-apis/mongodb-and-mongoose/install-and-set-up-mongoose.md
index 81baaa0c37a..f4334c80763 100644
--- a/curriculum/challenges/chinese/05-back-end-development-and-apis/mongodb-and-mongoose/install-and-set-up-mongoose.md
+++ b/curriculum/challenges/chinese/05-back-end-development-and-apis/mongodb-and-mongoose/install-and-set-up-mongoose.md
@@ -32,7 +32,7 @@ dashedName: install-and-set-up-mongoose
 
 **注意：**如果你使用的是 Replit，则无法创建 `.env` 文件。 相反，使用内置的 <dfn>SECRETS</dfn> 选项卡来添加变量。 在使用 <em>SECRETS</em> 选项卡时，<em>不要</em>将值括在引号中。
 
-When you are done, connect to the database by calling the `connect` method within your `myApp.js` file by using the following syntax:
+完成后，使用以下语法在你的 `myApp.js` 文件中调用 `connect` 方法，连接到数据库：
 
 ```js
 mongoose.connect(<Your URI>, { useNewUrlParser: true, useUnifiedTopology: true });
diff --git a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.md b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.md
index 07e562a5622..482643d4560 100644
--- a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.md
+++ b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.md
@@ -36,19 +36,19 @@ suite('GET /hello?name=[name] => "hello [name]"', function () {
 
 同时，请注意测试的回调函数中的 `done` 参数。 在测试结束时，调用它且不带参数，是发出异步操作完成所必需的信号。
 
-Finally, note the `keepOpen` method just after the `request` method. Normally you would run your tests from the command line, or as part of an automated integration process, and you could let `chai-http` start and stop your server automatically.
+最后，请注意 `request` 方法后面的 `keepOpen` 方法。 通常，你会从命令行中运行你的测试，或者作为自动集成过程的一部分，你可以让 `chai-http` 自动启动和停止你的服务器。
 
-However, the tests that run when you submit the link to your project require your server to be up, so you need to use the `keepOpen` method to prevent `chai-http` from stopping your server.
+然而，当你提交项目链接时运行的测试需要你的服务器是正常的，所以你需要使用 `keepOpen` 方法来防止 `chai-http` 停止你的服务器。
 
 # --instructions--
 
-Within `tests/2_functional-tests.js`, alter the `'Test GET /hello with no name'` test (`// #1`) to assert the `status` and the `text` of the response to make the test pass. Do not alter the arguments passed to the asserts.
+在 `tests/2_functional-tests.js` 中，修改 `'Test GET /hello with no name'` 测试（`// #1`），对响应的 `status` 和 `text` 使用断言来通过测试。 不要改变传递给断言的参数。
 
-There should be no URL query. Without a name URL query, the endpoint responds with `hello Guest`.
+不应该有任何 URL 查询。 如果没有名称 URL 查询，端点将使用 `hello Guest` 进行响应。
 
 # --hints--
 
-All tests should pass
+应通过所有测试。
 
 ```js
 (getUserInput) =>
@@ -62,7 +62,7 @@ All tests should pass
   );
 ```
 
-You should test for `res.status` == 200
+你应该测试 `res.status` == 200。
 
 ```js
 (getUserInput) =>
@@ -78,7 +78,7 @@ You should test for `res.status` == 200
   );
 ```
 
-You should test for `res.text` == `'hello Guest'`
+你应该测试 `res.text` == `'hello Guest'`。
 
 ```js
 (getUserInput) =>
diff --git a/curriculum/challenges/chinese/09-information-security/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.md b/curriculum/challenges/chinese/09-information-security/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.md
index 040165a4594..7911392cac2 100644
--- a/curriculum/challenges/chinese/09-information-security/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.md
+++ b/curriculum/challenges/chinese/09-information-security/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.md
@@ -10,7 +10,7 @@ dashedName: mitigate-the-risk-of-clickjacking-with-helmet-frameguard
 
 请注意，本项目是在 <a href="https://replit.com/github/freeCodeCamp/boilerplate-infosec" target="_blank" rel="noopener noreferrer nofollow">Replit</a> 上的初始化项目的基础上进行开发，你也可以从 <a href="https://github.com/freeCodeCamp/boilerplate-infosec/" target="_blank" rel="noopener noreferrer nofollow">GitHub</a> 上克隆。
 
-你的网页可能在未经你同意的情况下被放在 `<frame>` 或 `<iframe>` 中。 这可能会导致点击劫持攻击等情况。 点击劫持是一种欺骗用户的技术，使其与用户认为不同的页面进行互动。 This can be obtained by executing your page in a malicious context, by means of iframing. In that context, a hacker can put a hidden layer over your page. 隐藏的按钮可以被用来运行坏的脚本。 该中间件设置 X-Frame-Options 头。 它限制了谁可以把你的网站放在一个框架里。 它有三种模式：DENY、SAMEORIGIN 和 ALLOW-FROM。
+你的网页可能在未经你同意的情况下被放在 `<frame>` 或 `<iframe>` 中。 这可能会导致点击劫持攻击等情况。 点击劫持是一种欺骗用户的技术，使其与用户认为不同的页面进行互动。 这可以通过使用 iframe 恶意运行你的页面而获得。 在这种情况下，黑客可以在你的页面上设置一个隐藏层。 隐藏的按钮可以被用来运行坏的脚本。 该中间件设置 X-Frame-Options 头。 它限制了谁可以把你的网站放在一个框架里。 它有三种模式：DENY、SAMEORIGIN 和 ALLOW-FROM。
 
 我们不需要让我们的应用程序可以被嵌入。
 
diff --git a/curriculum/challenges/chinese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md b/curriculum/challenges/chinese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
index 31d85a3867f..f8e12fe8777 100644
--- a/curriculum/challenges/chinese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
+++ b/curriculum/challenges/chinese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
@@ -35,6 +35,12 @@ assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(ru
 assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].some(css => css?.keyText === '40%'));
 ```
 
+You should have 4 waypoints in your keyframe.
+
+```js
+assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].length === 4);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/chinese/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md b/curriculum/challenges/chinese/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md
index 5a53c50f3a3..83d26f263cf 100644
--- a/curriculum/challenges/chinese/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md
+++ b/curriculum/challenges/chinese/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md
@@ -1,15 +1,15 @@
 ---
 id: 63d8402e39c73468b059cd43
-title: "Build a Data Graph Explorer"
+title: "创建一个数据图表浏览器"
 challengeType: 10
 dashedName: build-a-data-graph-explorer
 ---
 
 # --description--
 
-You will be <a href="https://colab.research.google.com/#create=true" target="_blank" rel="noopener noreferrer nofollow">working on this project with Google Colaboratory</a>.
+你将使用 <a href="https://colab.research.google.com/#create=true" target="_blank" rel="noopener noreferrer nofollow">Google Colaboratory</a> 来完成这个项目。
 
-After going to that link, create a copy of the notebook either in your own account or locally. Once you complete the project and it passes the test (included at that link), submit your project link below. If you are submitting a Google Colaboratory link, make sure to turn on link sharing for "anyone with the link."
+进入该链接后，在你自己的账户或本地创建一个笔记本的副本。 Once you complete the project and it passes the test (included at that link), submit your project link below. If you are submitting a Google Colaboratory link, make sure to turn on link sharing for "anyone with the link."
 
 # --instructions--
 
diff --git a/curriculum/challenges/espanol/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md b/curriculum/challenges/espanol/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
index 3f79545a862..e8445ec49cb 100644
--- a/curriculum/challenges/espanol/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
+++ b/curriculum/challenges/espanol/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
@@ -21,9 +21,8 @@ Completa la función utilizando las reglas siguientes para modificar el objeto p
 
 -   Tu función debe devolver siempre el objeto `records` completo.
 -   Si `value` es una cadena vacía, elimina la propiedad `prop` dada del álbum.
--   Si `prop` no es `"tracks"` y `value` no es una cadena vacía, asigna el `value` a la `prop` de ese álbum.
--   Si `prop` es `"tracks"` y `value` no es una cadena vacía, añade el `value` al final del arreglo `"tracks"` existente del álbum.
--   Si el álbum no tiene una propiedad `"tracks"`, crea un nuevo arreglo para la propiedad `"tracks"` del álbum antes de añadirle el `value`.
+-   If `prop` isn't `tracks` and `value` isn't an empty string, assign the `value` to that album's `prop`.
+-   If `prop` is `tracks` and value isn't an empty string, add the `value` to the end of the album's `tracks` array. You need to create this array first if the album does not have a `tracks` property.
 
 **Nota:** Para las pruebas se utiliza una copia del objeto `recordCollection`. No debes modificar directamente el objeto `recordCollection`.
 
diff --git a/curriculum/challenges/espanol/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md b/curriculum/challenges/espanol/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
index c1d3ceec606..f3e72ff0216 100644
--- a/curriculum/challenges/espanol/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
+++ b/curriculum/challenges/espanol/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
@@ -35,6 +35,12 @@ Debe agregar un punto de referencia `40%` para `@keyframes wave`.
 assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].some(css => css?.keyText === '40%'));
 ```
 
+You should have 4 waypoints in your keyframe.
+
+```js
+assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].length === 4);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/german/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md b/curriculum/challenges/german/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
index 9fefdb93c18..f6b661f72a6 100644
--- a/curriculum/challenges/german/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
+++ b/curriculum/challenges/german/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
@@ -21,9 +21,8 @@ Complete the function using the rules below to modify the object passed to the f
 
 -   Your function must always return the entire `records` object.
 -   If `value` is an empty string, delete the given `prop` property from the album.
--   If `prop` isn’t `"tracks"` and `value` isn't an empty string, assign the `value` to that album’s `prop`.
--   If `prop` is `"tracks"` and `value` isn’t an empty string, add the `value` to the end of the album’s existing `"tracks"` array.
--   If the album doesn’t have a `"tracks"` property, create a new array for the album's `"tracks"` property before adding the `value` to it.
+-   If `prop` isn't `tracks` and `value` isn't an empty string, assign the `value` to that album's `prop`.
+-   If `prop` is `tracks` and value isn't an empty string, add the `value` to the end of the album's `tracks` array. You need to create this array first if the album does not have a `tracks` property.
 
 **Note:** A copy of the `recordCollection` object is used for the tests. You should not directly modify the `recordCollection` object.
 
diff --git a/curriculum/challenges/german/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md b/curriculum/challenges/german/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
index fe4ee872f74..ff124a22021 100644
--- a/curriculum/challenges/german/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
+++ b/curriculum/challenges/german/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
@@ -35,6 +35,12 @@ You should add a `40%` waypoint for `@keyframes wave`.
 assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].some(css => css?.keyText === '40%'));
 ```
 
+You should have 4 waypoints in your keyframe.
+
+```js
+assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].length === 4);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/italian/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md b/curriculum/challenges/italian/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
index bc3ebe6eaa2..c9fff63579d 100644
--- a/curriculum/challenges/italian/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
+++ b/curriculum/challenges/italian/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
@@ -21,9 +21,8 @@ Completa la funzione usando le regole sottostanti per modificare l'oggetto passa
 
 -   La funzione deve sempre restituire l'intero oggetto `records`.
 -   Se `value` è una stringa vuota, elimina la proprietà `prop` dall'album.
--   Se `prop` non è `"tracks"` e `value` non è una stringa vuota, assegna `value` alla `prop` di quell'album.
--   Se `prop` è `"tracks"` e `value` non è una stringa vuota, aggiungi `value` alla fine dell'array `"tracks"` già esistente dell'album.
--   Se l'album non ha una proprietà `"tracks"` crea un nuovo array per la proprietà `"tracks"` dell'album prima di aggiungervi `value`.
+-   If `prop` isn't `tracks` and `value` isn't an empty string, assign the `value` to that album's `prop`.
+-   If `prop` is `tracks` and value isn't an empty string, add the `value` to the end of the album's `tracks` array. You need to create this array first if the album does not have a `tracks` property.
 
 **Nota:** una copia dell'oggetto `recordCollection` viene utilizzata per i test. Non dovresti modificare direttamente l'oggetto `recordCollection`.
 
diff --git a/curriculum/challenges/italian/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md b/curriculum/challenges/italian/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
index dae65a70136..14f804fa48b 100644
--- a/curriculum/challenges/italian/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
+++ b/curriculum/challenges/italian/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
@@ -26,33 +26,33 @@ const body = JSON.stringify({ userName: userName, suffix: ' loves cats!' });
 xhr.send(body);
 ```
 
-Hai già visto molti di questi metodi. Here the `open` method initializes the request as a `POST` to the given URL of the external resource, and passes `true` as the third parameter - indicating to perform the operation asynchronously.
+Hai già visto molti di questi metodi. Qui il metodo `open` inizializza la richiesta come `POST` all'URL specificato della risorsa esterna, e passa `true` come terzo parametro - indicando l'esecuzione di un'operazione asincrona.
 
-The `setRequestHeader` method sets the value of an HTTP request header, which contains information about the sender and the request. It must be called after the `open` method, but before the `send` method. The two parameters are the name of the header and the value to set as the body of that header.
+Il metodo `setRequestHeader` imposta il valore di un'intestazione di richiesta HTTP, che contiene informazioni sul mittente e sulla richiesta. Deve essere chiamato dopo il metodo `open`, ma prima del metodo `send`. I due parametri sono il nome dell'intestazione e il valore da impostare come corpo di quell'intestazione.
 
-Next, the `onreadystatechange` event listener handles a change in the state of the request. A `readyState` of `4` means the operation is complete, and a `status` of `201` means it was a successful request. Therefore, the document's HTML can be updated.
+Successivamente, il listener dell'evento `onreadystatechange` gestisce un cambiamento nello stato della richiesta. Un `readyState` di `4` significa che l'operazione è completata, e uno `status` di `201` significa che la richiesta ha avuto successo. Pertanto, l'HTML del documento può essere aggiornato.
 
-Finally, the `send` method sends the request with the `body` value. The `body` consists of a `userName` and a `suffix` key.
+Infine, il metodo `send` invia la richiesta con il valore `body`. Il `body` è costituito da uno `userName` e un `suffix` chiave.
 
 # --instructions--
 
-Update the code so it makes a `POST` request to the API endpoint. Then type your name in the input field and click `Send Message`. Your AJAX function should replace `Reply from Server will be here.` with data from the server. Format the response to display your name appended with the text `loves cats`.
+Aggiorna il codice in modo da fare una richiesta `POST` all'endpoint API. Quindi digita il nome nel campo di input e fai click su `Send Message`. La funzione AJAX dovrebbe sostituire `Reply from Server will be here.` con i dati dal server. Formatta la risposta per mostrare il tuo nome con l'aggiunta del testo `loves cats`.
 
 # --hints--
 
-Your code should create a new `XMLHttpRequest`.
+Il tuo codice dovrebbe creare una nuova `XMLHttpRequest`.
 
 ```js
 assert(code.match(/new\s+?XMLHttpRequest\(\s*?\)/g));
 ```
 
-Your code should use the `open` method to initialize a `POST` request to the server.
+Il tuo codice dovrebbe utilizzare il metodo `open` per inizializzare una richiesta `POST` al server.
 
 ```js
 assert(code.match(/\.open\(\s*?('|")POST\1\s*?,\s*?url\s*?,\s*?true\s*?\)/g));
 ```
 
-Your code should use the `setRequestHeader` method.
+Il tuo codice dovrebbe utilizzare il metodo `setRequestHeader`.
 
 ```js
 assert(
@@ -62,13 +62,13 @@ assert(
 );
 ```
 
-Your code should have an `onreadystatechange` event handler set to a function.
+Il tuo codice dovrebbe avere un gestore di eventi `onreadystatechange` impostato a una funzione.
 
 ```js
 assert(code.match(/\.onreadystatechange\s*?=/g));
 ```
 
-Your code should get the element with class `message` and change its `textContent` to `userName loves cats`
+Il tuo codice dovrebbe ottenere l'elemento di classe `message` e cambiare il suo `textContent` in `userName loves cats`
 
 ```js
 assert(
@@ -78,7 +78,7 @@ assert(
 );
 ```
 
-Your code should use the `send` method.
+Il tuo codice dovrebbe usare il metodo `send`.
 
 ```js
 assert(code.match(/\.send\(\s*?body\s*?\)/g));
diff --git a/curriculum/challenges/italian/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md b/curriculum/challenges/italian/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
index da3f1f82405..dd26a4d6dad 100644
--- a/curriculum/challenges/italian/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
+++ b/curriculum/challenges/italian/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
@@ -35,6 +35,12 @@ Dovresti aggiungere un waypoint del `40%` per `@keyframes wave`.
 assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].some(css => css?.keyText === '40%'));
 ```
 
+You should have 4 waypoints in your keyframe.
+
+```js
+assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].length === 4);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/italian/14-responsive-web-design-22/learn-html-by-building-a-cat-photo-app/5efc4f528d6a74d05e68af74.md b/curriculum/challenges/italian/14-responsive-web-design-22/learn-html-by-building-a-cat-photo-app/5efc4f528d6a74d05e68af74.md
index 494d26f745f..3a6c6fe0775 100644
--- a/curriculum/challenges/italian/14-responsive-web-design-22/learn-html-by-building-a-cat-photo-app/5efc4f528d6a74d05e68af74.md
+++ b/curriculum/challenges/italian/14-responsive-web-design-22/learn-html-by-building-a-cat-photo-app/5efc4f528d6a74d05e68af74.md
@@ -25,7 +25,7 @@ La casella di spunta dovrebbe ancora avere un attributo `id` con il valore `lovi
 assert.equal($('input[type="checkbox"]')[0].id, 'loving');
 ```
 
-The text `Loving` should be wrapped in a `label` element.
+Il testo `Loving` dovrebbe essere racchiuso in un elemento `label`.
 
 ```js
 const checkboxInputElem = $('input[type="checkbox"]')[0];
@@ -71,7 +71,7 @@ const labelElem = document.querySelector('label[for="loving"]');
 assert(labelElem.textContent.replace(/\s/g, '').match(/Loving/i));
 ```
 
-There should be a space between your checkbox and your new `label` element.
+Dovrebbe esserci uno spazio tra la casella di spunta e il nuovo elemento `label`.
 
 ```js
 assert.match(code, />\s+<label\s+for\s*=\s*('|")loving/);
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md b/curriculum/challenges/italian/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md
index b73db8aeabe..a586faff6bc 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/build-a-data-graph-explorer-project/build-a-data-graph-explorer.md
@@ -7,13 +7,13 @@ dashedName: build-a-data-graph-explorer
 
 # --description--
 
-You will be <a href="https://colab.research.google.com/#create=true" target="_blank" rel="noopener noreferrer nofollow">working on this project with Google Colaboratory</a>.
+Lavorerai a <a href="https://colab.research.google.com/#create=true" target="_blank" rel="noopener noreferrer nofollow">questo progetto con Google Colaboratory</a>.
 
-After going to that link, create a copy of the notebook either in your own account or locally. Once you complete the project and it passes the test (included at that link), submit your project link below. If you are submitting a Google Colaboratory link, make sure to turn on link sharing for "anyone with the link."
+Dopo aver visitato il link, crea una copia del notebook nel tuo account o localmente. Una volta completato il progetto e superato il test (incluso in quel link), invia il link del progetto qui sotto. Se stai inviando un link di Google Colaboratory, assicurati di attivare la condivisione del link per "anyone with the link"
 
 # --instructions--
 
-For this challenge, you need to create a multi-function calculator using Python that take input and do the following:
+Per questa sfida, usando Python devi creare una calcolatrice multifunzione che prende un input ed esegue le seguenti operazioni:
 
 - Ottenere un file .csv in tre modi
   - caricandolo dal computer locale
@@ -26,5 +26,5 @@ For this challenge, you need to create a multi-function calculator using Python
 - Mostrare i dati come un grafico a dispersione o un grafico a linea
 - Essere in grado di fare tutto ciò per diverse combinazioni di colonne e interpretare i grafici
 
-Once you're done, submit the URL to the public Colab notebook on your Google drive.
+Quando hai finito, invia l'URL al notebook Colab pubblico sul tuo Google drive.
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/build-a-financial-calculator-project/build-a-financial-calculator.md b/curriculum/challenges/italian/17-college-algebra-with-python/build-a-financial-calculator-project/build-a-financial-calculator.md
index af80cbca78f..aba1b3a02a6 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/build-a-financial-calculator-project/build-a-financial-calculator.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/build-a-financial-calculator-project/build-a-financial-calculator.md
@@ -1,19 +1,19 @@
 ---
 id: 63d8401e39c73468b059cd42
-title: "Build a Financial Calculator"
+title: "Crea un Calcolatrice Finanziaria"
 challengeType: 10
 dashedName: build-a-financial-calculator
 ---
 
 # --description--
 
-You will be <a href="https://colab.research.google.com/drive/1zUAVAkwyjat4Z-8nfrajM1ut9UcO18We?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">working on this project with Google Colaboratory</a>.
+Lavorerai a <a href="https://colab.research.google.com/drive/1zUAVAkwyjat4Z-8nfrajM1ut9UcO18We?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">questo progetto con Google Colaboratory</a>.
 
-After going to that link, create a copy of the notebook either in your own account or locally. Once you complete the project and it passes the test (included at that link), submit your project link below. If you are submitting a Google Colaboratory link, make sure to turn on link sharing for "anyone with the link."
+Dopo aver visitato il link, crea una copia del notebook nel tuo account o localmente. Una volta completato il progetto e superato il test (incluso in quel link), invia il link del progetto qui sotto. Se stai inviando un link di Google Colaboratory, assicurati di attivare la condivisione del link per "anyone with the link"
 
 # --instructions--
 
-For this challenge, you need to create a multi-function calculator using Python that take input and do the following:
+Per questa sfida, usando Python devi creare una calcolatrice multifunzione che prende un input ed esegue le seguenti operazioni:
 
 - Calcolare la rendita con crescita mensile o continua
 - Calcolare la rata mensile di un mutuo
@@ -22,7 +22,7 @@ For this challenge, you need to create a multi-function calculator using Python
 - Risolvere equazioni logaritmiche
 - Convertire in (e da) notazione scientifica
 
-If you are struggling, you can follow the <a href="https://www.youtube.com/embed/c2AhGd6srJ0" target="_blank" rel="noopener noreferrer nofollow">video walkthrough for this project.</a>
+Se stai facendo fatica, puoi seguire la <a href="https://www.youtube.com/embed/c2AhGd6srJ0" target="_blank" rel="noopener noreferrer nofollow">guida per questo progetto.</a>
 
-Once you're done, submit the URL to the public Colab notebook on your Google drive.
+Quando hai finito, invia l'URL al notebook Colab pubblico sul tuo Google drive.
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/build-a-graphing-calculator-project/build-a-graphing-calculator.md b/curriculum/challenges/italian/17-college-algebra-with-python/build-a-graphing-calculator-project/build-a-graphing-calculator.md
index 73aa3105a1d..b640263df9e 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/build-a-graphing-calculator-project/build-a-graphing-calculator.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/build-a-graphing-calculator-project/build-a-graphing-calculator.md
@@ -17,7 +17,7 @@ Per questa sfida, usando Python devi creare una calcolatrice grafica che prende
 
 - Graficare una o più funzioni
 - Creare una tabella di valori (x,y)
-- Shade above or below the line
+- Ombreggiare sopra o sotto la funzione
 - Risolvere e graficare un sistema di equazioni
 - Zoomare avanti o indietro su un grafico
 - Risolvere equazioni quadratiche
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/build-a-multi-function-calculator-project/build-a-multi-function-calculator.md b/curriculum/challenges/italian/17-college-algebra-with-python/build-a-multi-function-calculator-project/build-a-multi-function-calculator.md
index 4be160915e8..2effeb414d8 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/build-a-multi-function-calculator-project/build-a-multi-function-calculator.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/build-a-multi-function-calculator-project/build-a-multi-function-calculator.md
@@ -17,7 +17,7 @@ Per questa sfida, usando Python devi creare una calcolatrice multifunzione che p
 
 - risolvere proporzioni
 - risolvere equazioni per x
-- factor square roots
+- fattorizzare radici quadrate
 - convertire decimali in frazioni e percentuali
 - convertire le frazioni in decimali e percentuali
 - convertire percentuali in decimali e frazioni
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-common-factors-and-square-roots/factoring.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-common-factors-and-square-roots/factoring.md
index ee81d6f49dd..69b02092a60 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-common-factors-and-square-roots/factoring.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-common-factors-and-square-roots/factoring.md
@@ -1,6 +1,6 @@
 ---
 id: 6331d251b51aeedd1a2bd648
-title: "Factoring"
+title: "Fattorizzazione"
 challengeType: 15
 videoId: Puyp_-ZYA54
 dashedName: factoring
@@ -8,7 +8,7 @@ dashedName: factoring
 
 # --description--
 
-This first video will show you how to find common factors and divide them out - in writing, then in code using loops and modulus operations.
+Questo primo video ti mostrerà come trovare i fattori comuni e raccoglierli - per iscritto e poi con il codice utilizzando loop e le operazioni di modulo.
 
 Ecco il <a href="https://colab.research.google.com/drive/1tB7N3QqHEbGk33v0BdTwZTVkS9ju9yn6?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab usato in questo video.</a>
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-functions-and-graphing/functions.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-functions-and-graphing/functions.md
index c9db8b86f50..7acd3b53827 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-functions-and-graphing/functions.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-functions-and-graphing/functions.md
@@ -10,7 +10,7 @@ dashedName: functions
 
 Questo primo video ti mostrerà cos'è una funzione e poi ti mostrerà le somiglianze tra le funzioni matematiche e le funzioni di Python.
 
-Here is the <a href="https://colab.research.google.com/drive/1d0e55NoKjKILIum34POv04h0OLpE_pkn" target="_blank" rel="noopener noreferrer nofollow">Colab notebook used in this and the next videos.</a>
+Ecco il <a href="https://colab.research.google.com/drive/1d0e55NoKjKILIum34POv04h0OLpE_pkn" target="_blank" rel="noopener noreferrer nofollow">notebook Colab usato in questo video e nei prossimi.</a>
 
 # --question--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-functions-and-graphing/graphing.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-functions-and-graphing/graphing.md
index 67d885b72ae..2761a80143e 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-functions-and-graphing/graphing.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-functions-and-graphing/graphing.md
@@ -10,7 +10,7 @@ dashedName: graphing
 
 Questo video ti mostrerà la connessione tra le funzioni e i grafici. Nota come il grafico è un modo per rappresentare gli input e gli output di una funzione. Poi il video ti mostrerà come tracciare il grafico di una funzione con Python.
 
-Here is the <a href="https://colab.research.google.com/drive/1UYorWd9-Btf_ZQyA9YdUzxzKR8rnVrSV#scrollTo=yJiVB8wdHRxS" target="_blank" rel="noopener noreferrer nofollow">Colab notebook to go with the last two videos</a> so you can start making your own graphs.
+Ecco il <a href="https://colab.research.google.com/drive/1UYorWd9-Btf_ZQyA9YdUzxzKR8rnVrSV#scrollTo=yJiVB8wdHRxS" target="_blank" rel="noopener noreferrer nofollow">notebook Colab per gli ultimi due video</a>, usalo per iniziare a creare grafici.
 
 # --question--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-how-to-solve-systems-of-equations/solving-systems.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-how-to-solve-systems-of-equations/solving-systems.md
index 9e48f1e7f4d..ca106ce72f7 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-how-to-solve-systems-of-equations/solving-systems.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-how-to-solve-systems-of-equations/solving-systems.md
@@ -8,7 +8,7 @@ dashedName: solving-systems
 
 # --description--
 
-The first video will show you the math behind solving a system of two equations without graphing, how you can factor an equation, and solve for a certain variable.
+Il primo video ti mostrerà la matematica necessaria per risolvere un sistema di due equazioni senza grafico, come puoi raccogliere fattori comuni in un'equazione e risolvere per una certa variabile.
 
 Ecco il <a href="https://colab.research.google.com/drive/1UfyQiXCedAAv5kcqgi_pGYV-HkSgN8YD?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab usato in questo video.</a>
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/linear-equations.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/linear-equations.md
index c513b57f2eb..9999694b9c3 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/linear-equations.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/linear-equations.md
@@ -1,6 +1,6 @@
 ---
 id: 6331d28ab51aeedd1a2bd650
-title: "Linear Equations"
+title: "Equazioni Lineari"
 challengeType: 15
 videoId: u0bgovPh4ME
 dashedName: linear-equations
@@ -8,19 +8,19 @@ dashedName: linear-equations
 
 # --description--
 
-This video will show you the math behind finding the y-intercept in a linear function, so you can develop the whole equation. Then the video will show you how to graph the whole function. You will also see how to do the whole process with Python code.
+Questo video ti mostrerà la matematica necessaria per trovare l'intercetta sull'asse y di una funzione lineare, in modo da poter sviluppare l'intera equazione. Poi il video ti mostrerà come tracciare il grafico dell'intera funzione. Vedrai anche come svolgere tutto il processo con il codice Python.
 
-Here is the <a href="https://colab.research.google.com/drive/1UJ1w-XFTuCfK6FI3H2GT0lbxd2HO3tQ6?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">Colab notebook to go with the last two videos,</a> so you can see the formulas.
+Ecco il <a href="https://colab.research.google.com/drive/1UJ1w-XFTuCfK6FI3H2GT0lbxd2HO3tQ6?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab per i prossimi due video,</a> che puoi usare per vedere le formule.
 
 # --question--
 
 ## --assignment--
 
-Add code to your algebra Colab notebook to graph a function from points or from equation input.
+Aggiungi il codice al notebook Colab per tracciare una funzione dai punti o dall'input dell'equazione.
 
 ## --text--
 
-If you know the slope ("m") and you have one (x,y) coordinate point, which of the following equations could you use to find "b", representing the y-intercept in Python?
+Se conosci la pendenza ("m") e hai un punto di coordinate (x,y), quale delle seguenti equazioni puoi utilizzare per trovare "b", che rappresenta l'intercetta sull'asse y in Python?
 
 ## --answers--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/linear-functions-extra.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/linear-functions-extra.md
index 6f22635d3c8..976c99c092c 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/linear-functions-extra.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/linear-functions-extra.md
@@ -1,6 +1,6 @@
 ---
 id: 6331d283b51aeedd1a2bd64f
-title: "Linear Functions: Extra"
+title: "Funzioni Lineari: Extra"
 challengeType: 15
 videoId: Emeex5gi5uA
 dashedName: linear-functions-extra
@@ -8,15 +8,15 @@ dashedName: linear-functions-extra
 
 # --description--
 
-This video will give you a deeper look into developing equations from word problems (so then you can write the code to solve or graph those equations). The video will also begin to look at data points as (x,y) coordinates. With this, you will begin to see the connection between Algebra and data science.
+Questo video ti darà una visione più approfondita nello sviluppo di equazioni da problemi testuali (in modo da poter scrivere il codice per risolvere o graficare quelle equazioni). Il video inizierà anche a esaminare i punti di dati come coordinate (x,y). Con questo, inizierai a vedere la connessione tra l'algebra e la scienza dei dati.
 
-Here is the <a href="https://colab.research.google.com/drive/1OzC7gqCNWNzwv50ziNeG2IJhbXm88-XK?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">Colab notebook used in this video.</a>
+Ecco il <a href="https://colab.research.google.com/drive/1OzC7gqCNWNzwv50ziNeG2IJhbXm88-XK?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab usato in questo video.</a>
 
 # --question--
 
 ## --text--
 
-Which of the following would you not use when displaying a graph?
+Quale delle seguenti opzioni non useresti per visualizzare un grafico?
 
 ## --answers--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/slope.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/slope.md
index 1cc287bcfee..16ddb8b58e6 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/slope.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-linear-functions/slope.md
@@ -1,6 +1,6 @@
 ---
 id: 6331d291b51aeedd1a2bd651
-title: "Slope"
+title: "Coefficiente angolare"
 challengeType: 15
 videoId: nURsz7SR5aM
 dashedName: slope
@@ -8,15 +8,15 @@ dashedName: slope
 
 # --description--
 
-This first video will focus on the slope of a line and how to calculate it.
+Questo primo video si concentra sulla pendenza di una retta (coefficiente angolare) e come calcolarla.
 
-Here is the <a href="https://colab.research.google.com/drive/1UJ1w-XFTuCfK6FI3H2GT0lbxd2HO3tQ6?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">Colab notebook used in this and the next videos.</a>
+Ecco il <a href="https://colab.research.google.com/drive/1UJ1w-XFTuCfK6FI3H2GT0lbxd2HO3tQ6?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab usato in questo e nei prossimi video.</a>
 
 # --question--
 
 ## --text--
 
-If you have already defined these variables, which of the following is the correct slope formula?
+Se hai già definito queste variabili, quale delle seguenti è la formula corretta della pendenza?
 
 ## --answers--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs-and-polynomials-extra.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs-and-polynomials-extra.md
index 241572a1dd6..f404ad254a0 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs-and-polynomials-extra.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs-and-polynomials-extra.md
@@ -8,15 +8,15 @@ dashedName: parent-graphs-and-polynomials-extra
 
 # --description--
 
-This next video will show you how to add sliders to your graphs, to see them change in real time. You will also see ways to use loops to find the roots of a graph, and how this method is different from factoring.
+Questo video ti mostrerà come aggiungere cursori ai grafici, per vederli cambiare in tempo reale. You will also see ways to use loops to find the roots of a graph, and how this method is different from factoring.
 
-Here is the <a href="https://colab.research.google.com/drive/1bspkmQVcKOXUuk-Orb0Mwl0GUGbqMpka?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">Colab notebook to go along with this video.</a>
+Ecco il <a href="https://colab.research.google.com/drive/1bspkmQVcKOXUuk-Orb0Mwl0GUGbqMpka?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab per questo video.</a>
 
 # --question--
 
 ## --text--
 
-How many sliders would you add to change the coefficients in a quadratic graph?
+Quanti cursori aggiungeresti per cambiare i coefficienti in un grafico quadratico?
 
 ## --answers--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs.md
index 1fa248fc7f2..17e65a4c723 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs.md
@@ -10,13 +10,13 @@ dashedName: parent-graphs
 
 In this video, you will see what these parent graphs look like, how to modify them, and how to do this all with Python code.
 
-Here is the <a href="https://colab.research.google.com/drive/1uwKuaHCC2WCUFKmXW-5NqWUlEP9ak7Pz?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">Colab notebook to go along with this video.</a>
+Ecco il <a href="https://colab.research.google.com/drive/1uwKuaHCC2WCUFKmXW-5NqWUlEP9ak7Pz?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab per questo video.</a>
 
 # --question--
 
 ## --text--
 
-In numpy, what is the cube root of x?
+In numpy, qual è la radice cubica di x?
 
 ## --answers--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-quadratic-equations/quadratics.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-quadratic-equations/quadratics.md
index 51901bcde48..4241fea8090 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-quadratic-equations/quadratics.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-quadratic-equations/quadratics.md
@@ -1,6 +1,6 @@
 ---
 id: 6363d2429078df117ce4c400
-title: "Quadratics"
+title: "Equazioni Quadratiche"
 challengeType: 15
 videoId: pPLBL3L0OGg
 dashedName: quadratics
@@ -8,15 +8,15 @@ dashedName: quadratics
 
 # --description--
 
-This video show you how to solve quadratic equations, and explain the coefficients ("A," "B," and "C") in the standard form and how to use them to find the roots and vertex.
+Questo video mostra come risolvere le equazioni quadratiche e spiega i coefficienti ("A, "B" e "C") nella forma standard e come usarli per trovare le radici e il vertice.
 
-Here is the <a href="https://colab.research.google.com/drive/1jr_k4awSSW1CBs9ma9oS_WnDblDjX3pc?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">Colab notebook to go along with this video.</a>
+Ecco il <a href="https://colab.research.google.com/drive/1jr_k4awSSW1CBs9ma9oS_WnDblDjX3pc?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab per questo video.</a>
 
 # --question--
 
 ## --text--
 
-In Python code, what is the formula for the x value of the vertex?
+Nel codice Python, qual è la formula per il valore x del vertice?
 
 ## --answers--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/introduction-to-college-algebra-with-python.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/introduction-to-college-algebra-with-python.md
index 834b288fe92..d5b648b8034 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/introduction-to-college-algebra-with-python.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/introduction-to-college-algebra-with-python.md
@@ -1,6 +1,6 @@
 ---
 id: 6331caa1b51aeedd1a2bd644
-title: "Introduction to College Algebra with Python"
+title: "Introduzione all'Algebra Universitaria con Python"
 challengeType: 15
 videoId: bO3Sn10-XNw
 dashedName: introduction-to-college-algebra-with-python
@@ -8,23 +8,23 @@ dashedName: introduction-to-college-algebra-with-python
 
 # --description--
 
-This first video includes an introduction to the course, how it will work, and how to use Google Colaboratory. Follow along to create your first Colab notebook.
+Questo primo video include un'introduzione al corso, come funziona e come utilizzare Google Colaboratory. Segui le istruzioni per creare il tuo primo notebook Colab.
 
-**Videos throughout these courses will reference problems from these two textbooks:**
+**I video in questo corso faranno riferimento a problemi tratti da questi due testi:**
 
-\- <a href="https://lyryx.com/subjects/business/business-mathematics/" target="_blank" rel="noopener noreferrer nofollow">Business Math, a Step-by-Step Handbook (2021) by Jean-Paul Oliver</a>
+\- <a href="https://lyryx.com/subjects/business/business-mathematics/" target="_blank" rel="noopener noreferrer nofollow">Business Math, a Step-by-Step Handbook (2021) di Jean-Paul Oliver</a>
 
-\- <a href="https://openstax.org/details/books/algebra-and-trigonometry" target="_blank" rel="noopener noreferrer nofollow">Algebra and Trigonometry by Jay Abramson</a>
+\- <a href="https://openstax.org/details/books/algebra-and-trigonometry" target="_blank" rel="noopener noreferrer nofollow">Algebra and Trigonometry di Jay Abramson</a>
 
 # --question--
 
 ## --assignment--
 
-Create an algebra <a href="https://drive.google.com/" target="_blank" rel="noopener noreferrer nofollow">Colab notebook on your google drive</a> so you can follow along with the videos.
+Crea un <a href="https://drive.google.com/" target="_blank" rel="noopener noreferrer nofollow">notebook Colab per l'algebra sul tuo google drive</a> in modo da poter seguire i video passo passo.
 
 ## --text--
 
-When adding text in Google Colab, what symbol would you use to create a heading that will appear in the table of contents?
+Quando aggiungi del testo in Google Colab, quale simbolo dovresti usare per creare un'intestazione che apparirà nel sommario?
 
 ## --answers--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/ratios-and-proportions-extra.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/ratios-and-proportions-extra.md
index 663f0cc63e5..2bdfc576099 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/ratios-and-proportions-extra.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/ratios-and-proportions-extra.md
@@ -1,6 +1,6 @@
 ---
 id: 6331d298b51aeedd1a2bd652
-title: "Ratios and Proportions: Extra"
+title: "Rapporti e Proporzioni: Extra"
 challengeType: 15
 videoId: 6o0SsdyUf2U
 dashedName: ratios-and-proportions-extra
@@ -8,25 +8,25 @@ dashedName: ratios-and-proportions-extra
 
 # --description--
 
-The last video in this section will show you how to use proportions in other applications, such as currency exchange rates and unit conversion. It will also show you more about setting up your notebook and working through the practice assignment.
+L'ultimo video di questa sezione ti mostrerà come utilizzare le proporzioni in altre applicazioni, come i tassi di cambio e la conversione di unità. Ti mostrerà anche altro sulla creazione dei notebook e su come svolgere le attività pratiche.
 
 # --question--
 
 ## --assignment--
 
-Open the following Colab notebook, run the cell, and <a href="https://colab.research.google.com/drive/1XjmHoERFKcvol7FPidQE-wgdvR82HV45" target="_blank" rel="noopener noreferrer nofollow">practice solving one-step algebra problems.</a> As a bonus, look at the code that generates the practice problems.
+Apri il seguente notebook Colab notebook, esegui la cella e <a href="https://colab.research.google.com/drive/1XjmHoERFKcvol7FPidQE-wgdvR82HV45" target="_blank" rel="noopener noreferrer nofollow">fai pratica a risolvere problemi di algebra in un unico passaggio.</a> Inoltre, guarda anche il codice che genera i problemi di pratica.
 
 ## --text--
 
-What is another way to write 0.9999... (repeating 9)?
+Qual è un altro modo per scrivere 0.9999... (9 periodico)?
 
 ## --answers--
 
-99 percent
+99 per cento
 
 ---
 
-You can't get an exact answer
+Non è possibile ottenere una risposta esatta
 
 ---
 
@@ -34,7 +34,7 @@ You can't get an exact answer
 
 ---
 
-Almost 1
+Quasi 1
 
 ## --video-solution--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/solving-proportions.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/solving-proportions.md
index 8371ec1655d..3ab3079997a 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/solving-proportions.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-ratios-and-proportions/solving-proportions.md
@@ -1,6 +1,6 @@
 ---
 id: 6331d29fb51aeedd1a2bd653
-title: "Solving Proportions"
+title: "Risolvere le Proporzioni"
 challengeType: 15
 videoId: 61A3PNx1hjY
 dashedName: solving-proportions
@@ -8,23 +8,23 @@ dashedName: solving-proportions
 
 # --description--
 
-Now we get to the math content. This video will show you how to set up and solve proportions and write code to solve for variables.
+E ora passiamo alla matematica. Questo video ti mostrerà come impostare e risolvere le proporzioni e scrivere il codice per risolvere per le variabili.
 
-Here is the <a href="https://colab.research.google.com/drive/1Q7nCcbrnoYttkwiHB_nQ-X1JuLpUmtRD?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">Colab notebook to go along with this video.</a> If you have not done so yet, set up your algebra Colab notebook from the last video. Then, add the code from this video to it.
+Ecco il <a href="https://colab.research.google.com/drive/1Q7nCcbrnoYttkwiHB_nQ-X1JuLpUmtRD?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab per seguire questo video.</a> Se non lo hai ancora fatto, crea un notebook Colab come spiegato nello scorso video. Poi, aggiungigli il codice da questo video.
 
 # --question--
 
 ## --assignment--
 
-Add the code from the video to the algebra Colab notebook you created in the first step.
+Aggiungi il codice del video al notebook Colab che hai creato nel primo step.
 
 ## --text--
 
-In solving a proportion, if one numerator is zero, does the other numerator have to be zero for the statement to be true?
+Nel risolvere una proporzione, se un numeratore è zero, l'altro numeratore deve essere zero perché l'affermazione sia vera?
 
 ## --answers--
 
-Yes
+Sì
 
 ---
 
@@ -32,7 +32,7 @@ No
 
 ---
 
-Sometimes
+A volte
 
 ## --video-solution--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-simple-and-compound-interest/simple-and-compound-interest-extra.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-simple-and-compound-interest/simple-and-compound-interest-extra.md
index 2152a749bf5..a0858edaffb 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-simple-and-compound-interest/simple-and-compound-interest-extra.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-simple-and-compound-interest/simple-and-compound-interest-extra.md
@@ -1,6 +1,6 @@
 ---
 id: 63dbd1335d93712ff177d96a
-title: "Simple and Compound Interest: Extra"
+title: "Interesse Semplice e Composto: Extra"
 challengeType: 15
 videoId: 2cbrstoKNSc
 dashedName: simple-and-compound-interest-extra
@@ -8,13 +8,13 @@ dashedName: simple-and-compound-interest-extra
 
 # --description--
 
-Here is a detour from the Python code, as this video shows you how to create mortgage payment amortization tables in Google Sheets. You will also learn about how to use a very similar setup to estimate retirement account investment returns. This is the video that shows you where your money is going.
+Ecco una deviazione dal codice Python, in quanto questo video mostra come creare tabelle di ammortamento dei pagamenti ipotecari in Google Sheets. Imparerai anche come utilizzare una configurazione molto simile per stimare i rendimenti degli investimenti del fondo pensione. Questo è il video che ti mostra dove stanno andando i tuoi soldi.
 
 # --question--
 
 ## --text--
 
-What marker do you use to attach a formula to a cell in a spreadsheet?
+Quale indicatore usi per allegare una formula a una cella in un foglio di calcolo?
 
 ## --answers--
 
diff --git a/curriculum/challenges/italian/17-college-algebra-with-python/learn-simple-and-compound-interest/simple-and-compound-interest.md b/curriculum/challenges/italian/17-college-algebra-with-python/learn-simple-and-compound-interest/simple-and-compound-interest.md
index 35f48aa78be..b4cea59a986 100644
--- a/curriculum/challenges/italian/17-college-algebra-with-python/learn-simple-and-compound-interest/simple-and-compound-interest.md
+++ b/curriculum/challenges/italian/17-college-algebra-with-python/learn-simple-and-compound-interest/simple-and-compound-interest.md
@@ -1,6 +1,6 @@
 ---
 id: 6363d26c9078df117ce4c405
-title: "Simple and Compound Interest"
+title: "Interesse Semplice e Composto"
 challengeType: 15
 videoId: iMPFK7wXNPg
 dashedName: simple-and-compound-interest
@@ -8,11 +8,11 @@ dashedName: simple-and-compound-interest
 
 # --description--
 
-This video will help you understand the equations of simple and compound interest, and what it all means.
+Questo video ti aiuterà a capire le equazioni dell'interesse semplice e composto, e cosa implicano.
 
 Ecco il <a href="https://colab.research.google.com/drive/1IVBaeX84arJXS73raRROaxbz4qMyFVb6?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab per questo video.</a>
 
-Here is an additional <a href="https://colab.research.google.com/drive/1-HWYmzKn6HmEUWMBv7G525CpoQpm8TnN?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">Colab notebook that shows you one way to put many of these interest and payment forumlas into Python functions.</a> Also you will see an example of using some formulas to output results, notice a trend, and follow up with other formulas to analyze patterns.
+Ecco un <a href="https://colab.research.google.com/drive/1-HWYmzKn6HmEUWMBv7G525CpoQpm8TnN?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">notebook Colab aggiuntivo che mostra un modo per inserire le formule di interessi e pagamenti in funzioni di Python.</a> Inoltre, vedrai anche un esempio di come usare alcune formule per generare risultati, individuare una tendenza e proseguire con altre formule per analizzare modelli.
 
 # --question--
 
@@ -22,19 +22,19 @@ In percent increase formulas, what does the "principle" refer to?
 
 ## --answers--
 
-the main amount
+la somma principale
 
 ---
 
-the ending amount
+la somma finale
 
 ---
 
-the starting amount
+la somma iniziale
 
 ---
 
-the (1 + rate) multiplier
+il moltiplicatore (1 + tasso)
 
 ## --video-solution--
 
diff --git a/curriculum/challenges/japanese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md b/curriculum/challenges/japanese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
index fe8fbfdaf28..68a8ed09980 100644
--- a/curriculum/challenges/japanese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
+++ b/curriculum/challenges/japanese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
@@ -21,9 +21,8 @@ Complete the function using the rules below to modify the object passed to the f
 
 -   Your function must always return the entire `records` object.
 -   If `value` is an empty string, delete the given `prop` property from the album.
--   If `prop` isn’t `"tracks"` and `value` isn't an empty string, assign the `value` to that album’s `prop`.
--   If `prop` is `"tracks"` and `value` isn’t an empty string, add the `value` to the end of the album’s existing `"tracks"` array.
--   If the album doesn’t have a `"tracks"` property, create a new array for the album's `"tracks"` property before adding the `value` to it.
+-   If `prop` isn't `tracks` and `value` isn't an empty string, assign the `value` to that album's `prop`.
+-   If `prop` is `tracks` and value isn't an empty string, add the `value` to the end of the album's `tracks` array. You need to create this array first if the album does not have a `tracks` property.
 
 **Note:** A copy of the `recordCollection` object is used for the tests. You should not directly modify the `recordCollection` object.
 
diff --git a/curriculum/challenges/japanese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md b/curriculum/challenges/japanese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
index 37dd1ffc97a..68182544d6a 100644
--- a/curriculum/challenges/japanese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
+++ b/curriculum/challenges/japanese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
@@ -35,6 +35,12 @@ assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(ru
 assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].some(css => css?.keyText === '40%'));
 ```
 
+You should have 4 waypoints in your keyframe.
+
+```js
+assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].length === 4);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/portuguese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md b/curriculum/challenges/portuguese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
index 98f0c8253de..caacff8c826 100644
--- a/curriculum/challenges/portuguese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
+++ b/curriculum/challenges/portuguese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
@@ -21,9 +21,8 @@ Complete a função usando as regras abaixo para modificar o objeto passado para
 
 -   A função precisa sempre retornar todo o objeto `records`.
 -   Se `value` for uma string vazia, remova a propriedade `prop` recebida do álbum.
--   Se `prop` não for `"tracks"` e `value` não for uma string vazia, atribua `value` à `prop` daquele álbum.
--   Se `prop` for `"tracks"` e `value` não for uma string vazia, adicione `value` ao final do array `"tracks"` existente no álbum.
--   Se o álbum não tiver uma propriedade `"tracks"`, criar um array para as propriedades `"tracks"` do álbum antes de adicionar `value` a ele.
+-   If `prop` isn't `tracks` and `value` isn't an empty string, assign the `value` to that album's `prop`.
+-   If `prop` is `tracks` and value isn't an empty string, add the `value` to the end of the album's `tracks` array. You need to create this array first if the album does not have a `tracks` property.
 
 **Observação:** uma cópia do objeto `recordCollection` é usada para testes. Você não deve modificar diretamente o objeto `recordCollection`.
 
diff --git a/curriculum/challenges/portuguese/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md b/curriculum/challenges/portuguese/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
index 40656e318a1..a0155fc80b1 100644
--- a/curriculum/challenges/portuguese/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
+++ b/curriculum/challenges/portuguese/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.md
@@ -26,33 +26,33 @@ const body = JSON.stringify({ userName: userName, suffix: ' loves cats!' });
 xhr.send(body);
 ```
 
-Você já viu vários desses métodos antes. Here the `open` method initializes the request as a `POST` to the given URL of the external resource, and passes `true` as the third parameter - indicating to perform the operation asynchronously.
+Você já viu vários desses métodos antes. Aqui, o método `open` inicializa a solicitação como um `POST` para um determinado URL de um recurso externo, passando `true` como terceiro parâmetro – indicando que se deve realizar a operação de modo assíncrono.
 
-The `setRequestHeader` method sets the value of an HTTP request header, which contains information about the sender and the request. It must be called after the `open` method, but before the `send` method. The two parameters are the name of the header and the value to set as the body of that header.
+O método `setRequestHeader` define o valor de um cabeçalho de solicitação HTTP, que contém informações sobre o remetente e sobre a solicitação. Ele deve ser chamado após o método `open`, mas antes do método `send`. Os dois parâmetros são o nome do cabeçalho e o valor a ser definido como o corpo desse cabeçalho.
 
-Next, the `onreadystatechange` event listener handles a change in the state of the request. A `readyState` of `4` means the operation is complete, and a `status` of `201` means it was a successful request. Therefore, the document's HTML can be updated.
+Em seguida, o listener do evento `onreadystatechange` trata a mudança no estado da solicitação. Um `readyState` com o valor `4` significa que a operação foi concluída, enquanto o `status` `201` significa que a solicitação foi um sucesso. Portanto, o HTML do documento pode ser atualizado.
 
-Finally, the `send` method sends the request with the `body` value. The `body` consists of a `userName` and a `suffix` key.
+Por fim, o método `send` envia a solicitação com o valor de `body`. O `body` consiste em um `userName` e uma chave `suffix`.
 
 # --instructions--
 
-Update the code so it makes a `POST` request to the API endpoint. Then type your name in the input field and click `Send Message`. Your AJAX function should replace `Reply from Server will be here.` with data from the server. Format the response to display your name appended with the text `loves cats`.
+Atualize o código para fazer uma solicitação de `POST` para o endpoint da API. Em seguida, digite seu nome no campo de entrada e clique em `Send Message`. Sua função do AJAX deve substituir `Reply from Server will be here.` pelos dados do servidor. Formate a resposta para que ela exiba seu nome anexado ao texto `loves cats`.
 
 # --hints--
 
-Your code should create a new `XMLHttpRequest`.
+O código deve criar uma nova `XMLHttpRequest`.
 
 ```js
 assert(code.match(/new\s+?XMLHttpRequest\(\s*?\)/g));
 ```
 
-Your code should use the `open` method to initialize a `POST` request to the server.
+O código deve usar o método `open` para inicializar uma solicitação de `POST` para o servidor.
 
 ```js
 assert(code.match(/\.open\(\s*?('|")POST\1\s*?,\s*?url\s*?,\s*?true\s*?\)/g));
 ```
 
-Your code should use the `setRequestHeader` method.
+O código deve usar o método `setRequestHeader`.
 
 ```js
 assert(
@@ -62,13 +62,13 @@ assert(
 );
 ```
 
-Your code should have an `onreadystatechange` event handler set to a function.
+O código deve ter um manipulador de evento `onreadystatechange` definido para uma função.
 
 ```js
 assert(code.match(/\.onreadystatechange\s*?=/g));
 ```
 
-Your code should get the element with class `message` and change its `textContent` to `userName loves cats`
+O código deve obter o elemento com a classe `message` e mudar seu `textContent` para `userName loves cats`
 
 ```js
 assert(
@@ -78,7 +78,7 @@ assert(
 );
 ```
 
-Your code should use the `send` method.
+O código deve usar o método `send`.
 
 ```js
 assert(code.match(/\.send\(\s*?body\s*?\)/g));
diff --git a/curriculum/challenges/portuguese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md b/curriculum/challenges/portuguese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
index 7d7c3ae5a40..5ffef1f8575 100644
--- a/curriculum/challenges/portuguese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
+++ b/curriculum/challenges/portuguese/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
@@ -35,6 +35,12 @@ Você deve adicionar um ponto de divisão de `40%` a `@keyframes wave`.
 assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].some(css => css?.keyText === '40%'));
 ```
 
+You should have 4 waypoints in your keyframe.
+
+```js
+assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].length === 4);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/portuguese/14-responsive-web-design-22/learn-html-by-building-a-cat-photo-app/5efc4f528d6a74d05e68af74.md b/curriculum/challenges/portuguese/14-responsive-web-design-22/learn-html-by-building-a-cat-photo-app/5efc4f528d6a74d05e68af74.md
index 839a0c0d17e..67b760e7387 100644
--- a/curriculum/challenges/portuguese/14-responsive-web-design-22/learn-html-by-building-a-cat-photo-app/5efc4f528d6a74d05e68af74.md
+++ b/curriculum/challenges/portuguese/14-responsive-web-design-22/learn-html-by-building-a-cat-photo-app/5efc4f528d6a74d05e68af74.md
@@ -25,7 +25,7 @@ A caixa de seleção deve ter o atributo `id` com o valor `loving`.  Eram espera
 assert.equal($('input[type="checkbox"]')[0].id, 'loving');
 ```
 
-The text `Loving` should be wrapped in a `label` element.
+O texto `Loving` deve estar dentro de um elemento `label`.
 
 ```js
 const checkboxInputElem = $('input[type="checkbox"]')[0];
@@ -71,7 +71,7 @@ const labelElem = document.querySelector('label[for="loving"]');
 assert(labelElem.textContent.replace(/\s/g, '').match(/Loving/i));
 ```
 
-There should be a space between your checkbox and your new `label` element.
+Deve haver um espaço entre a caixa de seleção e o novo elemento `label`.
 
 ```js
 assert.match(code, />\s+<label\s+for\s*=\s*('|")loving/);
diff --git a/curriculum/challenges/ukrainian/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md b/curriculum/challenges/ukrainian/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
index eccc4361481..cb148bd821d 100644
--- a/curriculum/challenges/ukrainian/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
+++ b/curriculum/challenges/ukrainian/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md
@@ -21,9 +21,8 @@ Complete the function using the rules below to modify the object passed to the f
 
 -   Your function must always return the entire `records` object.
 -   If `value` is an empty string, delete the given `prop` property from the album.
--   If `prop` isn’t `"tracks"` and `value` isn't an empty string, assign the `value` to that album’s `prop`.
--   If `prop` is `"tracks"` and `value` isn’t an empty string, add the `value` to the end of the album’s existing `"tracks"` array.
--   If the album doesn’t have a `"tracks"` property, create a new array for the album's `"tracks"` property before adding the `value` to it.
+-   If `prop` isn't `tracks` and `value` isn't an empty string, assign the `value` to that album's `prop`.
+-   If `prop` is `tracks` and value isn't an empty string, add the `value` to the end of the album's `tracks` array. You need to create this array first if the album does not have a `tracks` property.
 
 **Note:** A copy of the `recordCollection` object is used for the tests. You should not directly modify the `recordCollection` object.
 
diff --git a/curriculum/challenges/ukrainian/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md b/curriculum/challenges/ukrainian/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
index 71e261f57e9..0e45163e382 100644
--- a/curriculum/challenges/ukrainian/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
+++ b/curriculum/challenges/ukrainian/14-responsive-web-design-22/learn-css-transforms-by-building-a-penguin/619d324f5915c929f36ae91d.md
@@ -35,6 +35,12 @@ assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(ru
 assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].some(css => css?.keyText === '40%'));
 ```
 
+You should have 4 waypoints in your keyframe.
+
+```js
+assert([...[...new __helpers.CSSHelp(document).getCSSRules('keyframes')].find(rule => rule?.name === 'wave')?.cssRules].length === 4);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-fractions-and-decimals/converting-fractions-and-decimals.md b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-fractions-and-decimals/converting-fractions-and-decimals.md
index 8e96c90f9cb..2c6bf4861f5 100644
--- a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-fractions-and-decimals/converting-fractions-and-decimals.md
+++ b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-fractions-and-decimals/converting-fractions-and-decimals.md
@@ -16,7 +16,7 @@ dashedName: converting-fractions-and-decimals
 
 ## --assignment--
 
-Додайте код для перетворення дробів та десяткових чисел до свого блокноту Colab.
+Додайте код для перетворення дробів та десяткових чисел до свого блокнота Colab.
 
 ## --text--
 
diff --git a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-functions-and-graphing/functions-and-graphing-extra.md b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-functions-and-graphing/functions-and-graphing-extra.md
index 64192cfeb65..6cd6b7d7430 100644
--- a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-functions-and-graphing/functions-and-graphing-extra.md
+++ b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-functions-and-graphing/functions-and-graphing-extra.md
@@ -16,7 +16,7 @@ dashedName: functions-and-graphing-extra
 
 ## --assignemnts--
 
-Додайте код до свого блокнота Colab для функцій та графіків.
+Додайте код для функцій та графіків до свого блокнота Colab.
 
 ## --text--
 
diff --git a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-functions-and-graphing/graphing.md b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-functions-and-graphing/graphing.md
index d10b1c671e9..f58f90717c8 100644
--- a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-functions-and-graphing/graphing.md
+++ b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-functions-and-graphing/graphing.md
@@ -16,7 +16,7 @@ dashedName: graphing
 
 ## --assignemnts--
 
-Додайте код до свого блокнота Colab для функцій та графіків.
+Додайте код для функцій та графіків до свого блокнота Colab.
 
 ---
 
diff --git a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-how-to-solve-for-x/how-to-solve-for-x-extra.md b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-how-to-solve-for-x/how-to-solve-for-x-extra.md
index fceb6f7ec9a..abc1d66cb39 100644
--- a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-how-to-solve-for-x/how-to-solve-for-x-extra.md
+++ b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-how-to-solve-for-x/how-to-solve-for-x-extra.md
@@ -16,7 +16,7 @@ dashedName: how-to-solve-for-x-extra
 
 ## --assignment--
 
-Додайте код з відео для інших розв’язків рівняння до свого блокноту Colab.
+Додайте код з відео для інших розв’язків рівняння до свого блокнота Colab.
 
 ---
 
diff --git a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-how-to-solve-for-x/solving-for-x.md b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-how-to-solve-for-x/solving-for-x.md
index 4893d3f2177..92b9962a4d8 100644
--- a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-how-to-solve-for-x/solving-for-x.md
+++ b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-how-to-solve-for-x/solving-for-x.md
@@ -10,13 +10,13 @@ dashedName: solving-for-x
 
 Перше відео роз’яснить суть алгебри та покаже, як Python виконує те саме завдання, але по-іншому.
 
-Ось <a href="https://colab.research.google.com/drive/11Zi77gs1FKoEqfPqYa2HtTENiWZyQAO2?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">блокнот Colab для цього відео.</a> Додайте код з відео до свого блокноту з алгебри Colab, щоб побачити, як знайти х за допомогою Python. Потім (якщо хочете) змініть код, перевірте його та порівняйте з розв’язком на папері. Пам’ятайте, що рівняння повинне бути у синтаксисі Python.
+Ось <a href="https://colab.research.google.com/drive/11Zi77gs1FKoEqfPqYa2HtTENiWZyQAO2?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">блокнот Colab для цього відео.</a> Додайте код з відео до свого блокнота з алгебри Colab, щоб побачити, як знайти х за допомогою Python. Потім (якщо хочете) змініть код, перевірте його та порівняйте з розв’язком на папері. Пам’ятайте, що рівняння повинне бути у синтаксисі Python.
 
 # --question--
 
 ## --assignment--
 
-Додайте код з відео для розв’язку рівняння до свого блокноту Colab.
+Додайте код з відео для розв’язку рівняння до свого блокнота Colab.
 
 ## --text--
 
diff --git a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs-and-polynomials-extra.md b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs-and-polynomials-extra.md
index f7518645c46..64fb14191e7 100644
--- a/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs-and-polynomials-extra.md
+++ b/curriculum/challenges/ukrainian/17-college-algebra-with-python/learn-parent-graphs-and-polynomials/parent-graphs-and-polynomials-extra.md
@@ -8,7 +8,7 @@ dashedName: parent-graphs-and-polynomials-extra
 
 # --description--
 
-Наступне відео покаже, як додати слайдери до графіків, щоб бачити зміни в реальному часі. Ви також побачите способи використання циклів для того, щоб знайти корені графіка та дізнаєтесь, чим цей метод відрізняється від розкладання на множники.
+Наступне відео покаже, як додати повзунки до графіків, щоб бачити зміни в реальному часі. Ви також побачите способи використання циклів для того, щоб знайти корені графіка та дізнаєтесь, чим цей метод відрізняється від розкладання на множники.
 
 Ось <a href="https://colab.research.google.com/drive/1bspkmQVcKOXUuk-Orb0Mwl0GUGbqMpka?usp=sharing" target="_blank" rel="noopener noreferrer nofollow">блокнот Colab для цього відео.</a>
 
@@ -16,7 +16,7 @@ dashedName: parent-graphs-and-polynomials-extra
 
 ## --text--
 
-Скільки слайдерів ви б додали, щоб змінити коефіцієнти у графіку квадратичної функції?
+Скільки повзунків ви б додали, щоб змінити коефіцієнти у графіку квадратичної функції?
 
 ## --answers--