That means a vector that is at every point of the curve perpendicular to the curve and has length one.
也就是，曲线每一点上,垂直于曲线，模长为1的向量。
2
In this paper, a numerical method is presented for nearly arc length parameterization of parametric curve.
讨论参数曲线近似弧长参数化的数值方法。
3
The results showed that the change patterns of spacer length, ramet density, branching intensity, and branching Angle of Duchesnea indica were in a quadratic curve when the elevation increased.