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。

youdao

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。

youdao