一个模拟现实世界的秒表，可以无限制地使用，你可以进行一次，也可以两次，三次等，按任意键开始，按任意键结束！-A simulation of the real world, stopwatch, you can open the doors to unrestricted use, once you can can also be twice, thrice and so on, press any key to start, press any key to end!