self-propulsion element messuring device in waves

例句：

1. 1.The self-propulsion system of the spacecraft is highly efficient.
   该航天器的自推进系统非常高效。
2. 2. The autopilot was designed to ensure safe navigation in adverse weather conditions.
   自动驾驶仪被设计成在恶劣天气条件下确保安全导航。
3. 3.The propulsion system is responsible for moving the spacecraft forward.
   推进系统负责推动航天器前进。