求翻译：Because Auto Scaling always attempts to launch new instances before terminating old ones, being at or near the specified maximum capacity could impede or completely halt rebalancing activities. To avoid this problem, the system can temporarily exceed the specified maximum capacity of a group by a 10 percent margin during a rebalancing activity (or by a 1-instance margin, whichever is greater). The margin is extended only if the group is at or near maximum capacity and needs rebalancing, either as a result of user-requested rezoning or to compensate for zone availability issues. The extension lasts only as long as needed to rebalance the group是什么意思？

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