Once sending a segment, TCP sets a timer and waits for the ACK.
每发出一个报文段，TCP就设定一个定时器并等待确认信息。
参考来源 - 置位法解决TCP重传二义性问题·2,447,543篇论文数据，部分数据来源于NoteExpress
WS-RM doesn't define any way for this sender to asynchronously receive ACKs.
WS - RM没有定义任何方法用来使发送方异步接收ack。
The Man aimed a blow at his little enemy, but acks palm came on his head instead;
男人瞄准苍蝇打去，结果却打到了自己的头。
Acks are expensive and tend to be avoided in distributed systems wherever possible.
应答是相对耗费资源的，在分布式系统应尽量避免。
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