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。
They concluded that a timer switch, which he claimed would open the door after a set period in case he died or fell ill, did not in fact exist.
他们指出，Fritzl所谓的一旦他死去或者生病就能将那扇门打开的定时器，事实上并不存在。
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。
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