Countdown倒计时There were three more things to do before countdown. 开始倒计时之前还有3件事要做。很高兴第一时间为您解答，祝学习进步如有问题请及时追问，谢谢~~O(∩_∩)Ocountdown[英][?ka?ntda?n][美][?ka?nt?da?n]n.倒数读秒，倒计时; 大事临近的时期; 准备过程，准备工作;计时系统; 倒计时; 递减计数;复数：countdowns形近词：countdown双语例句柯林斯词典英英释义百度百科1there were three more things to do before countdown.开始倒计时之前还有3件事要做。2to stop the countdown during a missile or spacecraft launch在发射导弹或宇宙飞船时停止倒计时provided by gtcom
5，关于 down 和 countdown 区别
This is detailed. Hopefully, you can enjoy yourself.count down[phrasal verb]1 : to count numbers in a reverse order from higher numbers to lower ones 倒过来数数，动词词组 ? He counted down from 10 to 1.2 count down (something) also count (something) down : to pay close attention to the number of (days, miles, etc.) that remain until a particular moment or event is reached 倒数（如：倒数大运会）， 动词词组? He is counting down the days left in the school year. [=he is eagerly looking forward to the end of the school year] ? We were counting down the miles as we approached our destination. countdown /?ka?nt?da?n/ nounplural countdowns[count] 1 : the act of counting down the number of seconds that remain before something (such as the launch of a rocket) happens — usually singular 倒数，名词? Begin the countdown. ? The engineers stopped the countdown because something was wrong with the engine.2 : the period of time before an important or special event — usually singular — usually + to 前夕，名词? the countdown to summer vacation ? the steady countdown to war
