count down
柯林斯詞典
1. N-SING A countdown is the counting aloud of numbers in reverse order before something happens, especially before a spacecraft is launched. 倒計(jì)時(shí)[also no det]
The countdown has begun for the launch of the space shuttle. 航天飛機(jī)發(fā)射前的倒計(jì)時(shí)已經(jīng)開(kāi)始。
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