Time - Timer Expires 计时器过期 ; 计时器过时
Retransmission timer expires for a connection that is using the timer wheel algorithm.
一个使用计时器轮算法的连接的重新传输计时器计时到期。
Retransmission timer expires for a connection for the first time or the fast retransmit phase is turned on.
连接的重新传输计时器首次计时到期，或者打开了快速重新传输阶段。
Callbacks also get attached to things like timers so that when the timer expires, a specific section of code will be executed.
回调函数还可以与计时器等东西连接，当计时器到期时，就会执行特定的代码段。
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