Count-down time-recorder 倒计时计时器
I will count down three to zero, and then you can see that they reach the bottom almost at the same time.
我从3倒数到,你们能看到它们几乎,同时抵达底部。
Therefore, I set the timer to do the count down of time, say 15 or 20 minutes.
因此,我设置计时器做倒数计时的时间,例如15或20分钟。
This system has traffic light showing function, clock showing function and time count-down showing function.
该系统具有红绿灯显示功能、时钟显示功能及时间倒计时显示功能。
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