service rocket

例句：

1. 1. The servicerocket is a crucial component of the spacestation's life support system.
   服务火箭是空间站生命支持系统的关键组成部分。
2. 2.The service rocket was launched to deliversupplies to the far-off planet.
   服务火箭被发射到遥远的星球上运送物资。
3. 3. The service rocket carried out asuccessful test launch and successfully landed back onEarth.
   服务火箭进行了一次成功的试飞并安全返回地球。