The countdown has begun for the launch of the space shuttle.
航天飞机发射前的倒计时已经开始。
The countdown has started for the final launch of an American space shuttle.
美国最后一次航天飞机的发射任务已经开始倒计时。
The full launch team spent Saturday running through a complete countdown rehearsal.
发射小组已经在上周六进行了一次全员参加的发射倒计时演练。
NASA has resumed the countdown for the launch of space shuttle Discovery.
NASA已经恢复发射发现号航天飞机的倒计时。
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。
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。
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