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介绍了用两相切曲面于切点处相联系的曲挠圆，推导一种利用中曲率和曲挠圆半径矢量求相对法曲率和相对短程挠率的简便方法。
In this paper, we introduce a curved circle with two tangent surfaces at the tangent point, and deduce a simple method to find the relative and relative short-range deflections by using the medium curvature and the radius of curvature of the curved circle.