轮换式是一个数学定义。即如果一个多项式中的变数字母按照任何次序轮换后，原多项式不变，那么称该多项式是轮换多项式，简称轮换式。
介绍了全翻转式双向犁的曲柄摇块式限深轮换位机构的结构、工作原理及参数优化设计过程。
This paper introduces the structure and working principle of the crank rocker transposition mechanism of depth wheel on two way alternative plow and the process of optimizing its parameters.
从侧面看，你可以看到海豚式打腿…但是最基本的身体当凯文轮换向镜头，你会注意到不同outside - in运动他的脚。
From the side, you can see it's basic dolphin kick... but as Kevin rotates his body toward the camera, you'll notice the distinct outside-in motion of his feet.
在以阻止较低部分的斜盘式从行驶中，一反轮换单位也需要在这里。
In order to stop the lower part of the swashplate from moving, an anti-rotation unit is also needed here.
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