因此，在每个小时中，我们可以希望在 10 分钟内每一分钟触发一次计时器事件，而接下来的 50 分钟内不触发事件。

So, for example, suppose once an hour we want to get timer events every minute for 10 minutes, and then 50 minutes where no timer events occur.

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Tprof 工具是一个计时器剖析器，可以识别出在用户指定的一个时间间隔内哪些代码在 CPU 上运行。

The Tprof tool is a timer profiler that identifies what code is running on the CPU during a user-specified time interval.

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在图中，限制计时器设定为180秒，因此对一个原本中断而现在恢复的路由更新可能停留在限制状态内直到经过180秒。

In Figure, the holddown timer is set to 180 seconds. Therefore, an update to a route that was down and is now up could stay in the holddown state until the full 180 seconds have passed.

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We're also posting a practice exam for you to take, so after you're completely done your studying, it's good to have everything done before you take the practice exam, and then sit down just with this sheet here and your calculator, and ideally a timer, and make sure you can do the practice exam in the allotted amount of time.

我们还将给出一份模拟试题，因此在你完全复习好之后，最好先复习完,再做这份模拟试题，坐下来,只拿出这张表与计算器，最好还有个计时器，确保自己完成模拟题,在规定的时间内。

麻省理工公开课 - 化学原理课程节选