A rocket launch countdown. A common sound in the nineteen sixties. But this was not just another launch. It was the beginning of a historic event.
火箭发射倒计时，一个在二十世纪六十年代广为人知的声音，而这并不只是一次普通发射，而是一个具有历史意义的事件的开始。
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。
With the countdown nearing the 30-second mark, the launch had to be delayed briefly to investigate whether a vent arm had properly retracted, which it had.
随着倒计时靠近30秒的节点，发射不得不被延后去调查一只蒸汽臂是否已经被收回，事实上已经收回了。
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 and invited guests marked the 50th anniversary of Shepard's flight on Thursday with a re-broadcast of the countdown, launch and mission at his Cape Canaveral, Fla., launch pad.
星期四，通过播放当时在佛罗里达州卡纳维拉尔角发射台倒数，发射，和执行任务的录像，美国国家航空和宇宙航行局以及应邀的嘉宾纪念谢波德航行50周年。
When the last space shuttle readies for launch from the Kennedy Space Center, scheduled for July 8, NASA's giant digital countdown clock will be one of the most watched time pieces in the world.
美最后一架现役航天飞机“阿特兰蒂斯”号将于7月8日在肯尼迪宇航中心进行其最后的一次飞行 ，届时，NASA的巨大倒计时钟将成为最为世人瞩目的计时工具。
The agency attempted the launch last Wednesday but aborted it with about seven minutes left in the countdown due to a problem with a sensor monitoring high-pressure fuel.
韩国原计划于上周三进行发射，但在距离发射还有7分钟时，由于监测高压燃料的传感器出现问题，发射被临时取消。
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 city already had a foretaste of this in the week marking the launch of the one-year countdown.
一年倒计时刚开始的本周，这个城市就已经初尝苦果。
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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