Ack: Indicates that the acknowledgment number field is significant.
ACK：表明确认号字段是有意义的。
The experimental results suggest that some bits in the TCP sequence number and acknowledgment number can be selected out as flow ID with acceptable confliction probability.
实验结果表明，在可以接受的冲突概率下，tcp流首报文的顺序号和确认号的部分高位比特可以用来作为流标签。
When the congestion window on the sender is growing, it effectively doubles the number of packets in flight during the time it takes to send a packet and receive the acknowledgment back.
当发送方的拥塞窗口增大时，它会在发送出一个包和收到应答之间的时间内成倍地增加传输中的包的数目。
But on the other hand nobody acquiesces in an index number if he does not expect a personal advantage from its acknowledgment by public opinion.
但是，另一方面，如果人们不想从舆论之承认指数而得到个人的利益，谁也不会默认一个指数。
But on the other hand nobody acquiesces in an index number if he does not expect a personal advantage from its acknowledgment by public opinion.
但是，另一方面，如果人们不想从舆论之承认指数而得到个人的利益，谁也不会默认一个指数。
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