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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提供可让使用者将页面显示模式切换到目录模式的方法。

Provide a means for the user to switch the page display mode to catalog mode.

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当使用者将网页切换至不同的显示模式时，根据新显示模式的用途，页面通常会具有非常不同的外观。

When users switch to a different display mode on a Web page, the page will often take on a very different appearance, depending on the purpose of the new display mode.

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