anchor.diff:      to a token. When we write `injector.get(Foo)`, the injector returns
       the value associated with the token for the `Foo` class, typically an instance of `Foo` itself.
       
  -    符记是一个Angular的类型(`OpaqueToken`)。我们很少需要直接接触符记。绝大多数函数方法都接受类名称 (`Foo`)或者字符串("foo")，Angular把这些类名称和字符串转换为符记。
  -    当我们使用`injector.get(Foo)`，注入器返回与 `Foo`的类相关的符记的值，这个符记值一般是`Foo`类实例。
  +    令牌是一个Angular的类型(`OpaqueToken`)。我们很少需要直接接触令牌。绝大多数函数方法都接受类名称 (`Foo`)或者字符串("foo")，Angular把这些类名称和字符串转换为令牌。
  +    当我们使用`injector.get(Foo)`，注入器返回与 `Foo`的类相关的令牌的值，这个令牌值一般是`Foo`类实例。
   
       Angular makes similar requests internally during many of its operations
       as when it creates a [`Component`](#AppComponent) for display.
  
positive.code:      * [Two-way data binding with ngModel](guide/template-syntax.html#ng-model)
  
       绑定模式包括：
       * [插补Interpolation](guide/template-syntax.html#interpolation)
       * [属性绑定Property Binding](guide/template-syntax.html#property-binding)
       * [事件绑定Event Binding](guide/template-syntax.html#event-binding)
       * [特征绑定Attribute Binding](guide/template-syntax.html#attribute-binding)
  
negative.code:     
      Decorators are a JavaScript language [feature](https://github.com/wycats/javascript-decorators), implemented in TypeScript and proposed for ES2016 (AKA ES7).
      
      修饰器是一个Javascript的语言[特征](https://github.com/wycats/javascript-decorators)，修饰器在TypeScript里面已经采用并实施了，它也被推荐到ES2016（也就是ES7）
  
      We apply a decorator by positioning it
      immediately above or to the left of the thing it decorates.
  