In the book Course of Theorical Mechanics by Yanbai Zhou there are some mistakes about the expression of acceleration in arc coordinates, this paper has corrected them.
通过对周衍柏编写的《理论力学教程》第二版中的弧坐标中质点加速度表达式的推导作些改进。
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。
In the filed of computer vision and image processing, the characteristic parameters such as the center coordinates and radius of circle and arc parts often need to be measured by their images.
在计算机视觉和图像处理中，经常需要根据圆孔或圆弧的图像求取其中心坐标和半径等特征参数。
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