propulsive effort

例句：

1. 1. The ship's propulsion system is responsible for its speed.
   船的推进系统负责其速度。
2. 2.The rocket's propulsion system is designed to reach the moon.
   火箭的推进系统被设计用来到达月球。
3. 3.The propulsion system of the spacecraft is complex and requires careful maintenance.
   太空船的推进系统复杂，需要仔细维护。