Set off a rocket

• 发射火箭

Set off a rocket的用法和样例：

例句

1. They planned to send a rocket to the moon.
   他们计划向月球发射火箭。
2. 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,进入高层大气后即抛掉。