1.
The second rocket has divorced itself from the first spent rocket
第二级火箭已经脱离已燃尽的第一级火箭。
2.
The v-2 pushed the two-stage rocket to an altitude of 20 miles and then broke away.
V—2将第二级火箭推到20英里的高度，然后脱落。
3.
Numerical Simulation on Secondary Launcher Exhaust Plume Base Heating
二级火箭喷流对底部热环境影响的数值模拟
4.
The rocket rises and we can see the second stage ignite.
火箭升高了，我们可以看到二级点火。
5.
Rockets with more than one stage are called step rockets.
多于一级的火箭称为多级火箭。
6.
dual thrust rocket engine
双级推力火箭发动机
7.
timing of stage separating
火箭级分离程序定时
8.
the first stage of a multistage rocket.
多级火箭的早期阶段。
9.
As the step rocket goes up, some of the stages at the side fall away.
当多级火箭上升时，边上的几级火箭就脱落了。
10.
single-burn ascent
单级点火上升,用单级火箭送上轨道
11.
Long March II F carrier rocket
长征二号F运载火箭
12.
After the first stage burns out, it falls back to earth along a parabolic path, while the engines of the second stage fire to thrust the rocket into an earth orbit.
当第一级烧毁后，沿抛物线的轨道落到地球，而第二级的发动机点火把火箭发射到地球轨道。
13.
These were rockets with more than one engine.
多级火箭是装有一台以上发动机的火箭。
14.
One of the ways to make step rockets is to put the stages side by side by side at the bottom.
制造多级火箭的一种方法是把各级火箭并排放在底部。
15.
ABRV (Advanced Ballistic Re-entry Vehicle)
高级弹道重返大气层运载火箭
16.
Basic parameters analysis of first stage engine system for heavy lift vehicle
重型火箭下面级发动机基本参数分析
17.
The first-stage vehicle is used to launch the rocket and is then jettisoned in the upper atmosphere.
第一级运载火箭是用来发射火箭的, 进入高层大气後即抛掉.
18.
bipropellant liquid rocket motor
二元推进剂液体火箭发动机