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Although sometimes you may want an event that can only be raised by the base class, most of the time, you should enable the derived class to invoke base class events.
虽然有时您可能会想要使用只能由基底类别所引发的事件，但是在多数情形下，您应该启用衍生类别来叫用基底类别事件。
When you define a class that inherits from a base class, you sometimes want to redefine one or more of the base class elements in the derived class.
当您定义从基类继承的类时，有时会需要重定义派生类中的一个或多个基类元素。
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