说明：  在EWB环境下搭建数字钟；有“时”，“分”，“秒”（23小时59分59秒）显示且有校时功能的电子钟； 中小规模集成电路组成的电子钟
(EWB environment built in digital clock a " when" , " sub" , " second" (23 hours 59 minutes 59 seconds) shows a timing function and an electronic clock small and medium scale integrated circuits composed of clock)