convex curve短语¹⁴⁴⁹⁷²⁺² 基本例句 凸曲线 Equation about isometric polygon curve is set up with differential geometry theory. The curve is proved to be convex curve which the distance between any parallel tangent lines is equal. 应用微分几何理论，导出了等距曲线的方程，证明了它是具有任意两条平行切线之间距离都相等的卵形线。 cnki