Here, the message direction is from the message Box to the destination.
在这里，消息传输的方向是从Message Box传输到目的地去。
Send Ports can subscribe to a message directly from the message Box, without passing through the orchestration.
发送端口可以不经过业务流程直接从Message Box里面订阅消息，这就像实际中有些货物伴随着特定的优先许可。
Later, a receiver gets the message from the mail box and takes some type of action with it.
而后，接收者从邮箱中获得消息并对之采取某种动作。
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