使用LoadTest，可以指定要模拟的用户(线程)数量，甚至为这些线程的启动提供计时机制。

With a LoadTest, you can specify a number of users to simulate (that is, threads) and even provide a timing mechanism for the launching of threads.

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通过为LoadTest提供这两类计时器，可以更真实地模拟用户负载。

By providing these to a LoadTest, you can more realistically simulate user load.

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一个新的计时装置钟取代了旧装置，而古典的大笨钟声音也被转成一种模拟同样音乐的电子装置。

A new clockwork replaces the old one and the sounds of Big Ben have been transferred into an electronic movement that mimics exactly the same chords.

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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