anchor.diff:    The `karma-test-shim` tells Karma what files to pre-load and
     primes the Angular test framework with test versions of the providers that every app expects to be pre-loaded.
   
  -  `karma-test-shim`告诉Karma那些文件需要预加载，首要的是：带有“测试版供应商”的Angular测试框架是每个应用都希望预加载的。
  +  `karma-test-shim`告诉Karma哪些文件需要预加载，首要的是：带有“测试版供应商”的Angular测试框架是每个应用都希望预加载的。
   
   +makeExample('webpack/ts/config/karma-test-shim.js', null, 'config/karma-test-shim.js')(format=".")
   
  
positive.code:   We create separate, environment-specific configuration files that build on `webpack.common`
    by merging into it the peculiarities particular to their target environments.
  
    `webpack.common.js`配置中做了大部分繁重的工作。
    通过合并它们特有的配置，我们可以基于`webpack.common`为目标环境创建独立的、环境相关的配置文件。
  
    These files tend to be short and simple.
  
negative.code:   It's an excellent alternative to the *SystemJS* approach we use throughout the documentation.
    In this guide we get a taste of Webpack and how to use it with Angular 2 applications.
  
    它是我们在文档中到处使用的*SystemJS*的一个优秀替代品。这篇指南会带我们尝尝Webpack的滋味，并学习如何在Angular 2程序中使用它。
  
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    ## Table of contents
  