counter dead time

例句：

1. 1.The clock is counting down to the next hour.
   时钟正在倒数到下一个小时。
2. 2.The countdown to the big event begins tonight.
   大事件的倒计时从今晚开始。
3. 3. The countdown to the new year has begun.
   新年倒计时已经开始了。