这一级别可用于如下情况，在计费系统中，消息重复或丢失会导致不正确的结果。
This level could be used, for example, with billing systems where duplicate or lost messages could lead to incorrect charges being applied.
另一方面，他说，观点2通过使用定制媒体类型带来协议一级的消息可视性。
To the contrary, the second opinion, he says, leads to visibility of the messages at the protocol level via the use of custom media types.
这一级有时又称作 “发后即忘”，原因是向目的地发送消息后并不验证消息的接收。
This level is sometimes called fire and forget because the message is sent to its destination without verification of receipt.
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