到目前为止，我们已经有了一个可作为整体进行测试的功能系统，至少有一组能组成特定组件的相关函数。

By now, you should have a functional system that can be tested as a whole, or at least as a set of related functions that comprise a specific component.

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组成 Web 服务的各个组件分别是什么，它们是怎样作为一个整体工作的？

What are the various components of Web services and how do they work as a whole?

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