1.
A rocket stage designed to burn for three minutes before being jettisoned.
设计成在被抛弃之前可以燃烧三分钟的火箭的级
2.
Rockets with more than one stage are called step rockets.
多于一级的火箭称为多级火箭。
3.
the first stage of a multistage rocket.
多级火箭的早期阶段。
4.
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。
5.
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。
6.
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。
7.
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。
8.
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.
9.
At the sound of the pistol, the crew got off excellently.
多级火箭的最大级给出的第一次大推动，使得各级火箭全部离开地面。
10.
dual thrust rocket engine
双级推力火箭发动机
11.
timing of stage separating
火箭级分离程序定时
12.
single-burn ascent
单级点火上升,用单级火箭送上轨道
13.
These are two ways to make step rockets, one is to put the stages one on top lr the other.
有两种制造多级火箭的方法，一种是把一级放在另一级的项上。
14.
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。
15.
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
16.
launch pad
(火箭等的)发射台
17.
ballistic trajectory
(火箭的)放射弹道
18.
La fusée Delta 2 àdeux étages sest arrachée du pas de tir comme prévue à5h26 (11h26, àParis).
两级推动的德尔塔2型火箭，按预期于5：26（巴黎时间11：26），点火升空。