当它在水中或空气中旋转时就对桨叶产生推力，然后推动交通工具前进。
By its rotation in water or air, the propeller produces thrust on the Blades, which gives forward motion to the vehicle.
当它在水中或空气中旋转时就对桨叶产生推力，然后推动交通工具前进。
By its rotation in water or air, the propeller produces thrust on the Blades, which gives forward motion to the vehicle.
应用推荐