主动网络能更快速的发送包，但是需要更多的处理和带宽。
Proactive networks can convey traffic more quickly, but they involve more processing and bandwidth overhead.
要纠正这种丢失现象，首先需要发送端知道到发送包后并没有得到应答，然后重新传送这个包。
Correcting these dropped packets requires the transmitter to first recognize that the packet was not acknowledged, and then retransmit that packet.
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