single stage rocket 单级火箭 ; 单节火箭
two stage rocket 两级火箭
one-stage rocket 单级火箭 ; 一级火箭
two-stage rocket 双节火箭 ; 二级火箭 ; 两级火箭
recoverable-stage rocket 有回收级的多级火箭
final-stage rocket engine 末级发动机 ; 末级火箭发动机
final-stage rocket 末级火箭 ; 末级火箭发动机
second-stage rocket 第二级火箭 ; 火箭的第二级
single-stage rocket [航] 单级火箭
On the optimum mass ratios of two-stage rocket in the practical permissible region, we get the results analytic expression.
本文考虑二级火箭在实际允许区域内的最佳质量比问题，得到解的解析表达式。
South Korea launched a multi-stage rocket Tuesday in the country's first space shot, but the satellite it was carrying separated a few seconds later than planned and didn't reach the proper orbit.
韩国周二在该国的首次太空发射中发射了一枚多级运载火箭，但所携带卫星与火箭的分离时间比计划晚了几秒钟，卫星未能进入预定轨道。
The two-stage rocket, called Korea Space Launch Vehicle I or KSLV-I, blasted off at 5 p.m. into blue skies from the seaside Naro Space Center, near the city of Goheung on the country's south coast.
被称作“韩国航天运载器一号”的两级火箭是周二下午5时从韩国南部海岸高兴郡的罗老宇航中心发射升空的。
Two-and-one-half minutes after the Apollo Eleven launch, the first-stage rocket separated from the spacecraft.
VOA: special.2009.07.15
They fired the third-stage rocket.
VOA: special.2009.07.15
He adds that the newer version has a shorter launch time, better deterrent capability, and that it is a two-stage rocket using solid fuel that is highly maneuverable.
VOA: standard.2009.12.18
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