说明：  简单数字钟应该具有显示时－分－秒的功能。首先要知道钟表的工作机理，整个钟表的工作应该是在1Hz信号的作用下进行，这样每来一个时钟信号，秒增加1秒，当秒从59秒跳转到00秒时，分钟增加1分，同时当分钟从59分跳转。
(It should have a simple digital clock display- minutes- seconds function. We must first know the working mechanism of clocks, watches the entire work should be in the role of 1Hz signal is carried out so that each to a clock signal, second by 1 second, when the second jump 59 seconds to 00 seconds, minutes, 1-point increase while when the minutes 59 minutes to jump.)