anchor.diff:      A **barrel** is an Angular library module consisting of a logical grouping of single-purpose modules
       such as `Component` and `Directive`.
   
  -    一个**封装桶**是一个模块库，包含了按照逻辑分组到一起的单一用途的多个模块，比如组件和指令。
  +    一个**封装桶**是一个模块库，由单一用途的多个模块，比如组件和指令等组成。
   
       Familiar barrels include `angular2/core`, `angular2/common`, `angular2/platform/browser`,
       `angular2/http`, and `angular2/router`.
  
positive.code:     Barrels are packaged and shipped as [**bundles**](#bundle) that
      we may load with script tags in our `index.html`.
  
      封装桶被当做捆绑包[**bundles**](#bundle)打包和发布，以便我们通过Script标签在`index.html`页面里面装载。
  
      The script, `angular2.dev.js`, is a bundle.
      `angular2.dev.js`脚本就是一个捆绑包（bundle）
  
      Learn more in "[Modules, barrels and bundles](https://github.com/angular/angular/blob/master/modules/angular2/docs/bundles/overview.md)".
      获取更多关于模块，封装桶和捆绑包的信息："[Modules, barrels and bundles](https://github.com/angular/angular/blob/master/modules/angular2/docs/bundles/overview.md)"
  :marked
    ## Binding
    ## 绑定
  
negative.code:     Applications display data values to a user and respond to user
      actions (clicks, touches, keystrokes).
  
      应用程序一般将数据展示给用户，并对用户的操作（点击、触屏、按键）做出回应。
      
      We could push application data values into HTML, attach
      event listeners, pull changed values from the screen, and
      update application data values ... all by hand.
      
      我们可以自己处理这些操作：将数据显示到HTML网页，添加事件监听器，从屏幕获取数据变化，然后更新数据等等。。。
  
      Or we could declare the relationship between an HTML widget
      and an application data source ... and let a data binding
      framework handle the details.
      
      或者，我们可以声明HTML小部件和数据源的关系...，让一个数据绑定框架工具来处理所有细节。
  
      Data Binding is that second approach. Angular has a rich
      data binding framework with a variety of data binding
      operations and supporting declaration syntax.
      
      数据绑定是第二种方法。Angular有一个非常强大的数据绑定框架工具，具有多种用来数据绑定的操作，并支持声明语法规则。
  
       The many forms of binding include:
       * [Interpolation](guide/template-syntax.html#interpolation)
  