fix: 修改完了可复用动画

aio/content/guide/reusable-animations.md

@@ -1,40 +1,79 @@
 # Reusable animations
 
+# 可复用动画
+
 #### Prerequisites
 
+#### 前提条件
+
 A basic understanding of the  following concepts:
 
+对下列概念有基本的理解：
+
 * [Introduction to Angular animations](guide/animations)
+
+  [Angular 动画简介](guide/animations)
+
 * [Transition and triggers](guide/transition-and-triggers)
 
+  [转场与触发器](guide/transition-and-triggers)
+
 <hr>
 
 The [AnimationOptions](https://angular.io/api/animations/AnimationOptions) interface in Angular animations enables you to create animations that you can reuse across different components.
 
+Angular 动画库中的 [AnimationOptions](https://angular.io/api/animations/AnimationOptions) 接口让你能创建可以在不同组件之间复用的动画。
+
 ## Creating reusable animations
 
+## 创建可复用动画
+
 To create a reusable animation, use the [`animation()`](https://angular.io/api/animations/animation) method to define an animation in a separate `.ts` file and declare this animation definition as a `const` export variable. You can then import and reuse this animation in any of your app components using the [`useAnimation()`](https://angular.io/api/animations/useAnimation) API.
 
+要想创建可复用的动画，请使用 [`animation()`](https://angular.io/api/animations/animation) 方法来在独立的 `.ts` 文件中定义动画，并把该动画的定义声明为一个导出的 `const` 变量。然后你就可以在应用的组件代码中通过 [`useAnimation()`](https://angular.io/api/animations/useAnimation) 来导入并复用它了。
+
 <code-example path="animations/src/app/animations.ts" header="src/app/animations.ts" region="reusable" language="typescript" linenums="false">
 </code-example>
 
 In the above code snippet, `transAnimation` is made reusable by declaring it as an export variable.
 
+在上面的代码片段中，通过把 `transAnimation` 声明为一个导出的变量，就让它变成了可复用的。
+
 <div class="alert is-helpful">
 
 **Note:** The `height`, `opacity`, `backgroundColor`, and `time` inputs are replaced during runtime.
+
+**注意：**`height`、`opacity`、`backgroundColor` 和 `time` 这几个输入项会在运行期间被替换掉。 
+
 </div>
 
 You can import the reusable `transAnimation` variable in your component class and reuse it using the `useAnimation()` method as shown below.
 
+你可以在组件类中导入这个可复用的 `transAnimation` 变量，并通过 `useAnimation()` 方法来复用它。代码如下：
+
 <code-example path="animations/src/app/open-close.component.3.ts" header="src/app/open-close.component.ts" region="reusable" language="typescript" linenums="false">
 </code-example>
 
 ## More on Angular animations
 
+## 关于 Angular 动画的更多知识
+
 You may also be interested in the following:
 
+你可能还对下列内容感兴趣：
+
 * [Introduction to Angular animations](guide/animations)
+
+  [Angular 动画简介](guide/animations)
+
 * [Transition and triggers](guide/transition-and-triggers)
+
+  [转场与触发器](guide/transition-and-triggers)
+
 * [Complex animation Sequences](guide/complex-animation-sequences)
-* [Route transition animations](guide/route-animations)
+
+  [复杂动画序列](guide/complex-animation-sequences)
+
+* [Route transition animations](guide/route-animations)
+
+  [路由转场动画](guide/route-animations)