这是一个用C#编写的秒表程序，它根据你的设定时间（分钟）计时，到时自动弹出并发出三声Beep音（音量可调）或用Beep音唱出一首歌（节奏内设）-This is a C# prepared by the stopwatch procedures, which you have set time (minutes) time. when pop-up and issued three Beep Sound Voice (adjustable volume) or Beep sound sing a song (internal rhythm)