timer(timer和alarm区别)

timer是计时器的意思，而alarm则是闹钟的意思，区别可以从以下例子看出：

There is a timer in my mobile phone, also there is a alarm inside my phone, I can use them to help me getting up. 我的手机里有一个定时器，我的手机里也有一个闹钟，我可以用它们来帮助我起床。