特别地，绕平面上一点旋转物体，同样可以想象，旋转一个实体。
In particular, we have been rotating things about just a point in the plane What you could imagine also is instead you have your solid.
本文根据双螺杆横截面几何造型方程，运用MDT软件包，实现了同向和异向旋转双螺杆的三维实体造型。
According to the intermeshing mechanisms of co and counter rotating twin screws, the 3D solid modeling of twin screw was realized by using Mechanical Desktop(MDT) of AUTODESK in this paper.
将人体运动系统视为一由19个实体构成的刚性框架系统，每一实体上的父结点绕与上级实体连接的关节点旋转，该实体另一端的子结点则作为下一级实体的父结点。
The human moving system is defined as a rigid frame, which contains 19 articulate entities. Entity rotates around the father node and its son node is the father of another entity at the next level.
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