它只是获得消息并返回内容以供显示。
It just gets the message and returns the contents for display.
而后，接收者从邮箱中获得消息并对之采取某种动作。
Later, a receiver gets the message from the mail box and takes some type of action with it.
然后，目标应用程序可以订阅这个队列，并使用读取或接收函数获得消息。
Target applications can then subscribe to the queue and obtain the message using either the read or receive function.
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