N-SING A countdown is the counting aloud of numbers in reverse order before something happens, especially before a spacecraft is launched. 倒计时 [also no det]
The countdown has begun for the launch of the space shuttle.
航天飞机发射前的倒计时已经开始。
The countdown has begun for the launch of the space shuttle.
航天飞机发射前的倒计时已经开始。
The countdown has started for the final launch of an American space shuttle.
美国最后一次航天飞机的发射任务已经开始倒计时。
It was the countdown for Apollo Eleven the space flight that would carry men to the first landing on the moon.
VOA: special.2009.07.15
The countdown reached zero just as Frank Borman and James Lovell, in Gemini Seven, passed overhead.
VOA: special.2009.07.01
The countdown at Cape Canaveral reached zero as Gemini Seven passed overhead.
VOA: special.2009.07.01
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