讨论几何轨迹命题的推广，得列一些结论，从另一角度体现了高等几何与初等几何的联系。
The discussion on the popularization of locus proposition leads to some results, which shows the connection between higher geometry and lower geometry.
提出并实现了在CNC系统中完成曲面交线加工刀具轨迹直接插补的构想，可极大提高CNC系统的几何轨迹控制能力和使用性能。
The new idea that completing the tool-path interpolation for sculptured surfaces intersection machining in CNC system is presented and realized in this paper.
如果物体通过几何变换而被放置在世界坐标系中，比如通过平移和旋转，那么视图跟踪他在世界坐标系中位置变换的轨迹可能会是一个艰难的工作。
If the object is positioned in the world through geometric transformations, such as translations and rotations, then keeping track of its position in world coordinates can be a hard task.
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