切换到步行。

Switch to walking.

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当队列满员时，系统从异步行为切换到同步行为，这时，消息生成者生成消息的速度只能与消息使用者使用消息的速度一样快。

At that point, the system changes from asynchronous behavior to synchronous behavior, where the producer can enqueue messages only as fast as the consumer can dequeue them.

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