这样可以避免遍历该列表以检查现在哪些计时器计时到期，以及在后继周期中哪些计时器将计时到期。
This saves you from traversing the list to check which of the timers expire now and which of them expire in the subsequent cycles.
目前，指针处于槽位 1。 以该槽位为中心的三个计时器将立即计时到期、或者在后继周期中当指针达到相同槽处时计时到期。
The three timers pivoted to this slot expire at this instant or when the cursor reaches the same slot in the subsequent cycle.
因为AIX TCP RTO的最大值(tmax)是64秒，所以这个值足够大，可以确保在一个槽位中所有的重新传输计时器同时计时到期，而不需要等到后继的周期。
Since the maximum value (tmax) for the AIX TCP RTO is 64 seconds, this is large enough to ensure that all retransmission timers in a slot expire at the same time and not in the subsequent cycles.
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