只有当超时周期过期时，而且读取消息的应用程序没有删除它，消息才会重新出现在队列中。
The message will only reappear in the queue when the timeout period expires if, and only if, it has not been deleted by the reading process.
超时让您可以确保此值总是可以重新读取自您的数据中心。
The timeout allows you to ensure that the value is always reread from your data source.
在从队列中读取消息之后，队列的其他所有消费者就看不到这个消息，直到可见性超时周期过期为止。
When you read a message from a queue, that message automatically becomes invisible to all other consumers of the queue until the visibility timeout period set for the queue expires.
应用推荐