count down 倒计时；倒数计时；倒计数；(9,8,7,… 0 地)倒数；(火箭发射时)倒数秒数

【例句】
Watch it count down to the end of the day.
眼睁睁地看着倒计时直到世界末日。

As the New Year approaches they count down and celebrate together.
随着春节的临近，他们开始倒计数并一起庆祝。