count down:
(发射火箭等时)倒读数
名词count down:
1.counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)
同义词：countdown
动词count down:
1.count backwards; before detonating a bomb,for example
用法的名词就不用说了，动词的话比如
Count down the number of days
Count down to Christmas 2007
都是倒计时的意思
标签：count,down,用法
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