When this event is fired, the tail of the sequence (that is, the base sequence number) is moved forward to free up space.
激发此事件后，序列的尾数据（即基序列号）将前移以释放空间。
When this event is fired, the tail of the sequence (that is, the base sequence number) is moved forward to free up space.
激发此事件后，序列的尾数据（即基序列号）将前移以释放空间。
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