I'd say the reason is that otherwise a multiple-inheritance problem would occur.
我说的理由是，否则会出现多重继承的问题。
Because multiple inheritance of classes is dangerous.
因为类的多重继承有危险性。
Converting from a class or structure type based on multiple inheritance.
从多个继承的类别或结构型别转换而来。
With multiple inheritance, any call to Release goes to the same function.
用多继承，Release调用会使用同一个函数。
With multiple inheritance, any call to Release goes to the same function.
用多继承，Release调用会使用同一个函数。
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