backward bent vane

例句：

1. 1. The windturbine is designed to generate electricity by rotating its backward-bent vanes.
   风力发电机通过其后倾弯曲的叶片旋转来产生电力。
2. 2.The helicopter's rotor blades are designed to be backward-bent vanes for maximum efficiency.
   直升机的旋翼叶片设计为后倾弯曲的，以实现最大效率。
3. 3. The design of the propeller is crucial for the forward and backward movement of the aircraft.
   螺旋桨的设计对于飞机的前向和后向运动至关重要。