风带动风车旋转，风车又驱动石块将玉米磨成面粉。
The wind turned the windmill which then turned a large stone in order to make flour out of corn.
风叶有一个安装角或略有扭曲，因此可将吹来的风分解为两个分力，其中在风叶平面上的分力使风车旋转。
The sails are mounted at an angle or are given a slight twist, so that the force of wind against them has two components, one of which, in the plane of the sails, causes rotation.
老式风车能杀死鸟类是因为它们旋转得很快。
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