After the first set of messages, notice how the destination sends back an ack indicating that it received messages 1 and 3 — the sender now knows that it needs to resend just message 2.

在首批消息以后，请注意目的地怎么发送回ack来标志它收到了Messages 1和3，这是发送方意识到它仅仅需要重新发送Message 2。

youdao

Note that the acknowledgement isn't just for one message, it acknowledges all the messages successfully received by the RMD.

注意，这种确认并不是与消息一一对应的，而是代表对所有由RMD成功接收的消息的确认。

youdao

This simple application just outputs the received message, but you can just as easily extract the information from the XML document.

这个简单的应用程序仅仅输出所接收到的消息，但是您可以同样简单地从XML文档中提取信息。

youdao