... 减速火箭 制动火箭 retrograderocket 制动火箭发射 retrofire 制动火箭发动机 retardingrocketengine ; ...
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发射后差不多三天时间，制动火箭启动了，阿波罗8号飞船进入了月球轨道。
Nearly three days after launch, the braking engines fired and the Apollo 8 capsule went into orbit around the moon.
最后，在围绕地球的轨道运行的时候，计算机会精确地计算出应该在什么时候发射制动火箭以重返大气层。
Finally, when in orbit round the earth, the calculators calculate exactly when to fire the retro-rocket to effect re-entry.
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