1.Existing classes that were designed before generics may have semantics that resist the "obvious" generification approach.
在泛型之前设计的类可能阻碍了“显然的”泛型化方法。
2.I've already talked about two examples where backward compatibility limited the generification of the class libraries.
我已经讨论了两个例子，其中向后兼容性限制了类库的泛化。