我一拉绳子。，苹果就会往下掉，计时装置，也就会启动。

And the time... the moment that I pull this string the apple will fall, the contact will open, the clock will start.

youdao

此数字钟是一个将“时”、“分”、“秒”显示于人的视觉器官的计时装置。

This digital clock is a time-device, which can display "hour", "minute", "second".

youdao

此数字钟是一个将“时”、“分”、“秒”显示于人的视觉器官的计时装置。

This digital clock is a time-device, which can display "hour", "minute", "second".

youdao