countdown
n ~ (to sth)
(a) [C] counting seconds backwards to zero before firing a rocket, etc 倒数秒.
(b) [sing] (fig 比喻) period immediately before sth important happens 大事临近的时期
the countdown to the local election 地方选举日益临近的时候.
🗣️ 情景例句
We rely on the Earth for everyting we need to survive, so let's take care of it.
我们依赖地球获取我们生存的一切东西,因此让我们来细心呵护它。
My home is in the capital.It's a cosmopolitan city.