the blade of a rotor (as in the compressor of a jet engine)
impeller详细解释
im.pel.ler n.（名词）One that impels, as a rotating device used to force a fluid in a desired direction under pressure.推动器：用来使液体在压力下按需要的方向流动的旋转装置，可以起推动作用的东西A rotor or rotor blade.叶轮或叶轮片
