柯林斯詞典countdown /?ka?nt?da?n/ 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)開始。 返回 count down