根据渐近曲线的方程，具体给出主法线曲面的一族非直线的渐近曲线。

According to the equation of asymptotic curves, a family of nonlinear asymptotic curves are given to the principal normal surface.

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同时，对具有参数方程形式表示的非圆曲线进行了等间距直线逼近的节点误差分析。

While there is the analysis of node tolerance with parameter equation on approaching along a straight line with equal step.

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同时，对具有参数方程形式表示的非圆曲线进行了等间距直线逼近的节点误差分析。

While there is the analysis of node tolerance with parameter equation on approaching along a straight line with equal step.

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