记忆方法
将“countdown”拆分为“count”和“down”。想象一个倒计时活动，比如发射火箭或生日倒计时，人们“count”（数数）每一秒直到“down”（结束）。这样，你可以通过这个过程记住“countdown”的意思是倒数计时。
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英语词源
- countdown (n.)
- 1953, American English, in early use especially of launches of rockets or missiles, from count (v.) + down.
权威例句
- 1. There were three more things to do before countdown.
- 开始倒计时之前还有3件事要做。
- 2. The countdown to the Notting Hill Carnival is in its final hours.
- 诺丁山狂欢节已经进入了最后几个小时的倒计时。
- 3. the countdown to the wedding
- 婚礼的临近
- 4. 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。
- 5. If the countdown timer ever hits zero, do your validation processing.
- 处理这种情况的方法是在输入的同时使用递减计时器,每次击键重新计时.如果递减计时器变为零, 就开始验证.