However, two types of messages remain untracked: those that are removed from the queue when their time-to-be-received timer expires, and those that are purged from the queue.

 
  • 但不跟踪两种类型的消息:一种是当其接收时间计时器过期时从队列中移除的消息,另一种是从队列中清除的消息。
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