The unique types metric can also be helpful if an application's package structure is coarsely laid out in such a way that includes many classes in few packages.
如果应用程序的包结构大致上以某种在少数包中包含许多类的方式设计，则惟一类型度量(types metric)可能很有帮助。
This lets you make many types of changes to either your class structure or your XML document structure without needing to change the other to match.
这让您可以对类结构或XML文档结构中的一个作多种更改，而不必同时更改这两个结构以求匹配。
A tail fin, for example, has many different types of cells and is a very intricate structure.
一个尾鳍，例如有许多不同类型的细胞，是一个很复杂的结构。
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