count down

US /ˈkaʊnt daʊn/
UK /ˈkaʊnt daʊn/
"count down" picture
1.

倒计时

to announce the numbers in reverse order to zero, especially before the launch of a rocket or the start of an event

:
The engineers began to count down the final minutes before liftoff.
工程师们开始倒计时发射前的最后几分钟。
We're going to count down from ten to zero.
我们将从十倒数到零。
2.

倒数, 翘首以盼

to eagerly await an event

:
The children are counting down the days until Christmas.
孩子们正在倒数圣诞节的到来。
I'm counting down to my vacation next month.
我正在倒数下个月的假期。