anchor.diff:    > [**Lifecycle hooks**](lifecycle-hooks.html): We can tap into key moments in the lifetime of a component, from its creation to its destruction, 
     by implementing the lifecycle hook interfaces.
     
  -  > [**生命周期钩子Lifecycle Hooks**](lifecycle-hooks.html)：通过实现生命周期钩子接口，可以切入组件生命中的几个关键点：从创建到销毁。
  +  > [**生命周期钩子**](lifecycle-hooks.html)：通过实现生命周期钩子接口，可以切入组件生命中的几个关键点：从创建到销毁。
     
     > [**Pipes**](pipes.html): Services that transform values for display.
     We can put pipes in our templates to improve the user experience. Consider
     this `currency` pipe expression,
     
  -  > [**管道Pipes**](pipes.html)：这种服务会转换值以供显示。可以把管道放在模板中，以增强用户体验。比如这个`currency`管道表达式，
  +  > [**管道**](pipes.html)：这种服务会转换值以供显示。可以把管道放在模板中，以增强用户体验。比如这个`currency`管道表达式，
     
   <div style="margin-left:40px">
   code-example().
  
positive.code:  
    * we register *providers* with injectors.
    
    * 把*提供商*注册到注入器。
  
    * The *injector* is the main mechanism.
      * An injector maintains a *container* of service instances that it created.
      * An injector can create a new service instance from a *provider*.
  
    * A *provider* is a recipe for creating a service.
  
    * We register *providers* with injectors.
  
  .l-main-section
  :marked
  
negative.code:   `@angular/core`库是主要的Angular模块库，从这里能获得大部分需要的东西。
    
    <br clear="all">
    There are other important Angular libraries too, such as `!{_at_angular}/common`, `!{_at_angular}/router`, and `!{_at_angular}/animate`.
    We import what we need from an Angular !{_library_module}.
    
  