diff --git a/aio/content/guide/animations.md b/aio/content/guide/animations.md
index e822e42b3f..9eee85859e 100644
--- a/aio/content/guide/animations.md
+++ b/aio/content/guide/animations.md
@@ -33,6 +33,9 @@ keyframes as a fallback instead (automatically). This means that the polyfill is
 code uses [AnimationBuilder](/api/animations/AnimationBuilder). If your code does use AnimationBuilder, then
 uncomment the `web-animations-js` polyfill from the `polyfills.ts` file generated by Angular CLI.
 
+对于 Angular 6，如果浏览器没有提供对 Web 动画 API 的原生支持，Angular 就会自动改用 CSS 的关键帧动画作为后备实现。这意味，除非要在代码中使用 [AnimationBuilder](/api/animations/AnimationBuilder) ，否则不必使用相关的腻子脚本。
+如果你要在代码中使用 AnimationBuilder ，就要从 Angular CLI 自动生成的 `polyfills.ts` 文件中反注释掉 `web-animations-js` 腻子脚本。
+
 </div>
 
 <div class="l-sub-section">
@@ -50,21 +53,32 @@ The examples in this page are available as a <live-example></live-example>.
 Before you can add animations to your application, you need
 to import a few animation-specific modules and functions to the root application module.
 
+在往应用中添加动画之前，你要首先在应用的根模块中引入一些与动画有关的模块和函数。
+
 <code-example path="animations/src/app/app.module.ts" region="animations-module" title="app.module.ts (animation module import excerpt)" linenums="false"></code-example>
 
 #### Example basics
 
+#### 基本例子
+
 The animations examples in this guide animate a list of heroes.
 
+这里的动画例子用来给英雄列表添加动画。
+
 A `Hero` class has a `name` property, a `state` property that indicates if the hero is active or not,
 and a `toggleState()` method to switch between the states.
 
+`Hero` 类有一个 `name` 属性、一个 `state` 属性（用于表明该英雄是否为激活状态）和一个 `toggleState()` 函数，用来在这两种状态之间切换。
+
 <code-example path="animations/src/app/hero.service.ts" region="hero" title="hero.service.ts (Hero class)" linenums="false"></code-example>
 
 Across the top of the screen (`app.hero-team-builder.component.ts`)
 are a series of buttons that add and remove heroes from the list (via the `HeroService`). 
 The buttons trigger changes to the list that all of the example components see at the same time.
 
+在屏幕的顶部（`app.hero-team-builder.component.ts`）是一系列按钮，用于从列表中添加和删除英雄（通过 `HeroService`）。
+这些按钮会引起列表的变化，同时可以看到列表中的所有范例组件。
+
 {@a example-transitioning-between-states}
 
 ## Transitioning between two states
diff --git a/aio/content/guide/pipes.md b/aio/content/guide/pipes.md
index 76f65a681e..df7848e352 100644
--- a/aio/content/guide/pipes.md
+++ b/aio/content/guide/pipes.md
@@ -326,6 +326,8 @@ Angular通过*变更检测*过程来查找绑定值的更改，并在每一次Ja
 
 Angular picks a simpler, faster change detection algorithm when you use a pipe.
 
+当使用管道时，Angular 会选用一种更简单、更快速的变更检测算法。
+
 <h3 class="no-toc">No pipe</h3>
 
 <h3 class="no-toc">无管道</h3>
diff --git a/aio/content/guide/structural-directives.md b/aio/content/guide/structural-directives.md
index 07f0f516ff..8bcff98389 100644
--- a/aio/content/guide/structural-directives.md
+++ b/aio/content/guide/structural-directives.md
@@ -977,5 +977,4 @@ You learned
 
 * to write a [custom structural directive](guide/structural-directives#unless), `UnlessDirective`.
 
-
    写了一个[自定义结构型指令](guide/structural-directives#unless) —— `UnlessDirective`。