这个队列保存应用程序已经发送，但是还没有得到远程端确认的数据(根据未确认数据包的数量，一些数据可能还未发送到网络)。
This queue holds data that the application has sent but has not been acknowledged by the remote end (and may not have even been sent on the network depending on how many packets are unacknowledged).
将异常信息存储到未确认其状态的FEM数据库。
The exception information is stored to the FEM database with a status of not confirmed.
如果在报文段中的数据未确认之前定时器超时，TCP就认为该报文段已经丢失或出现损坏，从而重传这一报文段。
If the timer expires before data in the segment is acknowledged, TCP assumes that the segment has lost or being damaged, and a retransmission is sent.
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