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.
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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