追踪大型合理代码基底：分割和克服。
提高大型代码基底的维护性可以是十分困难的，特别是在没有分层或者可识别结构时更是这样。
Improving the maintainability of a large legacy code base can be very difficult, especially where there is no layering or identifiable structure.
通常来说，外部的代码基底可以变得很大，在许多种情况下，它们在代码中只是在界面上相关。
Often, the external code bases could be very large and, in many cases, are relevant only in the interface to the code.
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