You will now have two options: Line or Arc.
此刻你只能有两种操作：线或弧。
In character recognition, a straight line or arc used as a segment of a graphic character.
在字符识别中，用以构成图形字符中某一小段的直线或弧。
In this way, first of all the machined contour curve must be divided in many micro-sections of line or arc, and then node coordinates are found.
这样首先必须将要加工的轮廓曲线划分成微小的直线段或圆弧段，而后求出其节点坐标。
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