推进器的叶片已经安装好了。
通过加快推进器的旋转来增加其推力，同时改变叶片的角度来改变推力的方向。
Speeding up the propeller's rotation increases its thrust, while shifting the blades' angles changes the direction of the thrust.
风力推动固定在转轴上两三个像推进器一样的叶片。
The energy in the wind turns two or three propeller-like blades around a rotor.
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