若为复杂清除，您可能就会有许多程序逻辑和方法呼叫，而且其中某些可能会失败。
For complex cleanup, you may have a lot of program logic and many method calls, some of which might fail.
若已经在执行绪上呼叫这个方法，无法重新启用该执行绪的自动清除。
When this method has been called on a thread, automatic cleanup cannot be re-enabled for that thread.
呼叫方法之后接收的事件不会跟现有事件一起被清除。
Events received after the call to the method are not cleared along with the existing events.
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