hand-operated propeller

例句：

1. 1. The newmodel airplane has a hand-operatedpropeller that makes it easy to control.
   这款新型飞机的旋翼是手操作的，使得操控起来非常方便。
2. 2. The oldcar had a hand-operated propeller that was difficult to start.
   那辆旧车的手操作螺旋桨很难启动。
3. 3. Theboat's hand-operated propeller is the only way to navigate throughthe choppy waters.
   这艘船的手操作螺旋桨是唯一在激流中航行的方式。