propeller characteristic

例句：

1. 1.The airplane's propeller is the most important part of its engine.
   飞机的螺旋桨是其引擎最重要的部分。
2. 2. The boat's propeller was damaged in the storm.
   船的螺旋桨在暴风雨中受损了。
3. 3.The propeller rotates at a high speed to move the ship forward.
   螺旋桨以高速旋转，以推动船只前进。