booster rocket

例句：

1. 1. The new booster rocket has been launched successfully.
   新型助推火箭已成功发射。
2. 2. The booster rocket is designed to propel the spacecraft into orbit.
   助推火箭旨在将航天器送入轨道。
3. 3. The booster rocket was used to test the new launch system.
   助推火箭被用来测试新的发射系统。