wind·mill /ˈwɪn(d)ˌmɪl/
  風車
  Wind·mill n. A mill operated by the power of the wind, usually by the action of the wind upon oblique vanes or sails which radiate from a horizontal shaft.
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  windmill
       n 1: a mill that is powered by the wind
       2: generator that extracts usable energy from winds [syn: aerogenerator,
           wind generator]