A countdown is the counting aloud of numbers in reverse order before something happens, especially before a spacecraft is launched.
例句
The countdown has begun for the launch later today of the American space shuttle...美國航天飛機的發射已于今天晚些時候開始進入倒計時。There were three more things to do before countdown.開始倒計時之前還有3件事要做。
N-COUNT
臨近時期
The countdown to an event is the period of time leading up to the event.
例句
...the countdown to the next election.下次選舉的臨近
英英詞典釋義
Noun
1. counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)