数字秒表，要求从00:00秒开始计时，最大计时时间为99:99秒。并且具有启动、暂停和清零（复位）等功能。-Digital stopwatch, requiring from 00:00 seconds to start the timer, the maximum time of 99:99 seconds time. And has a start, pause, and clear (reset) and other functions.