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.
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。
In practice, when two elements with "restrained warping" come together at a sharp Angle, you need to couple the displacements and rotations, but leave the out-of-plane warping decoupled.
实际上，当两个“约束扭转”的单元以一个尖锐的角度组合在一起的时候，你需要耦合他们的唯一合转角，但是它们平面外的自由度解藕。
And just to give you a sense, if you do a cross-cut of this, you cannot show it from this Angle, but it should really be sort of a dumbbell shape with the nodal plane in between the two nuclei.
告诉你们这些就是给你们点概念，假如你们把他横切切开，不能从角度上展示，但它还是会保留几分哑铃的形态，以及在两核之间的节面。
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