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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本文对主经圆定理给出了一个简练的解析证明，并且在此定理的思想基础上，得到了椭圆上法线的两个性质定理。

This paper has given a pithy analytic Proof of "principal diameter circle"Theorem. And on the basis of the thought of the theorem. We obtain two theorem about ellipse normal.

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本文对主经圆定理给出了一个简练的解析证明，并且在此定理的思想基础上，得到了椭圆上法线的两个性质定理。

This paper has given a pithy analytic Proof of "principal diameter circle"Theorem. And on the basis of the thought of the theorem. We obtain two theorem about ellipse normal.

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