查词历史：
- countdown count for nothing
n.
- 复数： countdowns
1.
N-SING
(尤指航天器发射前的)倒计时 A countdown is the counting aloud of numbers in reverse order before something happens, especially before a spacecraft is launched.
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The countdown has begun for the launch later today of the American space shuttle...
美国航天飞机的发射已于今天晚些时候开始进入倒计时。
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There were three more things to do before countdown.
开始倒计时之前还有3件事要做。
2.
N-COUNT
临近时期 The countdown to an event is the period of time leading up to the event.
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...the countdown to the next election.
下次选举的临近
- Noun
-
1. counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)
航天
<名>
- 1.倒（数）计时
