So an easy thing to do in planar geometry is I want to make a line segment.
在平面几何里比较容易的一件事，就是做一个线段。
Considering visual analysis, traffic safety in some sense means that divers can clearly see the road alignment make up of planar and vertical alignments.
从视觉分析的角度出发，为保证行车安全，应尽可能让驾驶员清晰地看到由平面与纵断线形构成的道路线形。
Though, in the planar design, the visual percept itself is at rest, the changes of the figure and colors show a variety of dynamic forces so as to make the planar vision active.
在平面设计中虽然视觉对象本身是静止的，但图形与色彩的变化表现出各种动态力，促使平面视觉变得积极活跃。
This paper took discal cam as an example to bring forward a method of using computer program to get 3D geometric data of planar part and make its model in reverse.
以盘形凸轮为例，提出一种用计算机编程实现平面零件实物三维几何数据获取以及模型反求的方法。
By studying on jacobin matrix of planar, a method that can make the machine avoid singularity on operating is put forward.
通过对五杆机构雅可比矩阵的分析，提出了避免机床在工作时出现奇异位形的方法。
By studying on jacobin matrix of planar, a method that can make the machine avoid singularity on operating is put forward.
通过对五杆机构雅可比矩阵的分析，提出了避免机床在工作时出现奇异位形的方法。
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