Your point is less than -200. And your ID has been closed forever. You can't do anything.
你的分值已低于-200分，它已被永久关闭，你不能对此做任何操作。
If the app doesn't want to do anything special for this ID, it returns NULL, and the window function senses this and news up the appropriate default object.
如果程序不需要这个ID，则返回NULL，窗口函数根据返回值创建恰当的默认对象。
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