很好用的计时器，可以正计时，也可以倒计时，是因为我们要给学生进行口语考试，但下载了几个计时器，老师们都反应不好用，我就自己写了一个计时器，老师们都很喜欢。-Good use timer that can is timing, you can also countdown, because we give students oral exam, but downloading a few timers, teachers are bad reaction, I wrote a timer, tea