其在运行过程中非常安静，而且固定叶片的结构简单。
It was very quiet in operation, and of simple construction with fixed blades.
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.
一旦固定好后，这使得叶片可承受更少的压力。
一旦固定好后，这使得叶片可承受更少的压力。
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