NASA plans to use a five-segment shuttle booster as the first stage of its Ares I rocket, one of two being designed as part of the post-shuttle Constellation program.
NASA计划用五级航天飞机助推火箭作为Ares I火箭的第一级,Ares i是淘汰航天飞机后的星座计划使用的两种火箭之一。
One foreign rocket engineer calculates that the Long March 7 would need two of the 18-ton engines for its second stage.
一位外国火箭工程师的计算,长征7条将需要其第二阶段的18吨重的两个引擎。
Two-and-one-half minutes after the Apollo Eleven launch, the first-stage rocket separated from the spacecraft.
阿波罗11发射两分半钟后,第一级火箭从宇宙飞船中分离出来。
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