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. (尤指航天器发射前的)倒计时
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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. 临近时期
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