火箭起飞助推器

例句：

1. 1. The rocket booster is the first stage of a spacecraft's launch.
   火箭助推器是航天器发射的第一阶段。
2. 2. The rocket booster is responsible for propelling the spacecraft into orbit.
   火箭助推器负责将航天器送入轨道。
3. 3.The rocket booster is designed to increase the speed and altitude of the spacecraft.
   火箭助推器设计用来增加航天器的速度和高度。