The first type of dynamic data to look at is the substitution.

我们需要了解的第一个动态数据类型是 置换。

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Now that I've worked through the easy parts of the processing, the only part remaining is the actual type substitution handling.

现在我们已经完成了最简单的处理部分，剩下的惟一部分是实际的类型替换处理。

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You can see the type substitution code in action in the output at the bottom of Listing 6 (restructured slightly for formatting).

在清单6底部的输出中(为了格式化稍微重新调整了结构)，可以看到类型替换代码的作用。

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