anchor.diff:    [testing library](https://pub.dartlang.org/packages/angular2_testing)
     to run unit tests on our application parts as they interact with the Angular framework.
     
  -  > [**测试Testing**](testing.html)：Angular提供了一个测试库(https://pub.dartlang.org/packages/angular2_testing)，
  +  > [**测试**](testing.html)：Angular提供了一个[测试库](https://pub.dartlang.org/packages/angular2_testing)，
     在程序各个部分与Angular框架交互同时，用来“单元测试”它们。
  
positive.code:   > [**Animations**](animations.html): The animation library makes it easy for developers to animate component behavior
    without deep knowledge of animation techniques or CSS.
      
    > [**动画Animations**](animations.html) ： 即将到来的动画库。它能让开发人员更轻易的给组件添加动画行为，而不需要对动画技术或css有深入的了解。
    
    > **Bootstrap**: A method to configure and launch the root application component.
    
    > **引导Bootstrap**： 配置和引导应用的根组件的方法。
    
    > **Change detection**: Learn how Angular decides that a component property value has changed and 
    when to update the screen. 
    Learn how it uses **zones** to intercept asynchronous activity and run its change detection strategies. 
    
    > **变更检测Change Detection**：学会Angular是如何决定组件的属性值变化和什么时候该更新到屏幕的。 
    学会它如何使用**zones**来拦截异步行为和它如何执行变更检测策略。
    
    > **Component router**: With the component Router service, users can navigate a multi-screen application 
    in a familiar web browsing style using URLs.
    
    > **组件路由Component Router** - 通过组件路由服务，可以让用户使用浏览器中熟悉的URL形式，在多屏应用之间导航。
    
    > **Events**: The DOM raises events. So can components and services. Angular offers mechanisms for
    publishing and subscribing to events including an implementation of the [RxJS Observable](https://github.com/zenparsing/es-observable) proposal.
    
    > **事件Events** - DOM能触发事件，组件和服务也能。Angular提供的事件发布与订阅机制还包括[RxJS可观察Observable](https://github.com/zenparsing/es-observable)方案的一个实施。
    
    > [**Forms**](forms.html): Support complex data entry scenarios with HTML-based validation and dirty checking.
    
    > [**表单Forms**](forms.html)：通过基于HTML的验证和脏检查机制支持复杂的数据输入场景。
    
    > [**HTTP**](server-communication.html): Communicate with a server to get data, save data, and invoke server-side actions with this Angular HTTP client.
    
  
negative.code:   
    1. [数据绑定(Data Binding)](#data-binding)
    
    1. [Directives](#directives)
    
    1. [指令(Directives)](#directives)
    
    1. [Services](#services)
    
    1. [服务(Services)](#services)
    
    1. [Dependency Injection](#dependency-injection)
    
  