如果衍生类别未提供替代执行个体，则这个方法应该呼叫基底实作。
If the derived class does not provide a substitute instance, this method should call the base implementation.
如果覆写这个方法，就必须呼叫基底实作。
If you do override this method, you must call the base implementation.
如果您覆写这个方法，请先呼叫基底实作以保留所需的功能。
If you override this method, call the base implementation first to preserve the desired functionality.
如果您覆写这个方法，请先呼叫基底实作以保留所需的功能。
If you override this method, call the base implementation first to preserve the desired functionality.
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