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.

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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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在这种情况下，链球菌细菌蛋白质的代码与基底神经节细胞的代码非常接近。

In this case, the protein code on the strep bacteria is a close match with the code on the cells in the basal ganglia.

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在这种情况下，链球菌细菌蛋白质的代码与基底神经节细胞的代码非常接近。

In this case, the protein code on the strep bacteria is a close match with the code on the cells in the basal ganglia.

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