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.
换句话说，对于所有接收到的消息，策略应用第一级过滤，而路由对象应用第二级过滤。
In other words, a policy may apply first-level filtering while route objects apply second-level filtering on all received messages.
在听到三鹿要破产的消息后，全国各地的数百名三鹿一级经销商蜂拥而至。
Sanlu in to hear the news of bankruptcy throughout the country hundreds of Sanlu flocked to a dealer.
当需要让一个特定的缓存失效，会通过Redis消息系统给一级缓存发送删除通知。
When a specific cache invalidation is required they use Redis messaging to publish removal notices to the "L1" caches.
当需要让一个特定的缓存失效，会通过Redis消息系统给一级缓存发送删除通知。
When a specific cache invalidation is required they use Redis messaging to publish removal notices to the "L1" caches.
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