栈顶的地址就代表最后一次被调用的函数（也就是当前的活动函数）。

The address at the top of the stack represents the function that was last called (that is, the active function).

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这个用况场景对采用自底向上方法开发的地址簿web服务与采用自顶向下方法开发的同一个Web服务的互操作性进行了比较。

This use case scenario compares the interoperability of an address book Web service developed using the bottom-up approach to that of the same Web service developed using the top-down approach.

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