unaabbr.(英国)联合国协会(=United Nations Association)Una.n.尤娜(女子名)unactedadj.未付诸行动的(未实行的；未受影响的)

1. When the network needs to control the congestion, the signal will be delivered to the receiver at the fast speed, and was brought to the initiator by the acknowledgement frame.
   当网络需要预防拥塞发生时，标记将以最快的速度到达接收端，并且被确认帧带回到发送端。