Scientists have computed the probable course of the rocket.
科学家利用计算机计算了火箭可能运行的轨道。
A rocket manned by trained astronauts will launch soon.
载有受过训练的宇航员的火箭马上就要发射了。
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.