manual operated marine proportional control valves

例句：

1. 1.The new maneuvering system for the ship has greatly improved its performance.
   该船的新操纵系统极大地提高了其性能。
2. 2.The pilot used a manual operated marine proportional control valve to adjust the speed of the propeller.
   飞行员使用手动操作的海洋比例控制阀来调整螺旋桨的速度。
3. 3.The engineers had to manually operated marine proportional control valves to maintain the stability of the ship's engine.
   工程师们不得不手动操作海洋比例控制阀来保持船只引擎的稳定性。