A secant is defined as line passing through two points of the curve.

割线的定义是一条通过曲线上两点的直线。

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In some splines, the curve does not pass through any of the points that define the curve.

在一些曲尺中，曲线不经过定义曲线的任何点。

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In calculation models of cutting volume for dredging project, the cross section is usually a special one through survey points, and the curve of the river bed is assumed to be a line or a polyline.

通常疏浚工程中挖槽土方量计算模型的河床横断面是通过测量点的特殊断面，该断面轮廓曲线假定为近似直线或折线。

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