1·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。
2·An Edge is a line segment, and you add Edge objects to a design through the add_line method of the Entities class.
Edge是一条线段，可以通过entities类的add_line方法将Edge对象添加到设计中。
3·I think he did not really understand the essence of division of line segment.
俺觉得他并没有真正懂得线段划分的最本质内涵。
4·Take the local direction as the heuristic information, trace the road boundaries on the edge image and get the line segment representation of the first catalog road boundaries.
在边缘图像的基础上，以局部方向作为启发信息，跟踪道路边界，得到第一类道路边界的线段表示。
5·He is changing the winding line segment dividing standards of teachers.
就是他擅自改变了缠师的线段划分标准。