A timer is an object that can be set to invoke a method after the specified period of time elapses.
计时器(timer)是一个对象，通过设置计时器，可以在指定时间段过后调用某个方法。
If you need to do something within certain period of time you can set up timer. It is very useful during the test or for cooking.
如果您需要在一定的时间内完成某件事情，您还可以设置定时器，在测试或者烹饪中非常的实用。
Simply set a timer and start typing and when the time is up, you'll instantly know how many words you have typed for that period of time.
简单地设置一个计时器，并开始输入，当时间到了，你会立刻知道你多少单词键入的那段时间。
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