counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)
造句
用作名詞(n.)
His heartbeat escalates, like the countdown for death. 他心跳加快，就象死亡在倒數。
I will never employ any device with a digital countdown. 我將不會使用任何倒數計時用具。
常用短語
countdown profile
操作程序表
countdown circuit
發射控制電路,脈沖分...
automatic countdown
自動倒數時間計算...
trigger countdown
觸發器脈沖分頻...
countdown sequence timer
逆序計時器
count down
(發射火箭等時)倒讀...
組詞
The count-down begins for the first Test match.
出自：Times
近義反義詞
countess
count
countable set
count of yarn
counting loop
countingframe
count up mode
counting ring
counting vial
counting down
counting grid
counting sort