conic section template 二次曲线模板
degenerated conic section 降级锥曲线
Kegelschnitt conic section 圆锥部分
centre of conic section 二次曲线心
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N one of a group of curves formed by the intersection of a plane and a right circular cone. It is either a circle, ellipse, parabola, or hyperbola, depending on the eccentricity, e, which is constant for a particular curve e = 0 for a circle; e<1 for an ellipse; e = 1 for a parabola; e>1 for a hyperbola 圆锥曲线 (Often shortened to conic)
A conic section whose plane is not parallel to the axis base or generatrix of the intersected cone.
圆锥的一部分，其切面既不平行于轴和基面，也不平行于圆锥母线。
However, when determining the different orders of four points, there is difference existing in the conic section type.
但是，不同顺序的四点在决定二次曲线类型存在着差异。
Given a hexagon inscribed in a conic section, the three pairs of the continuations of opposite sides meet on a straight line, called the Pascal line.
已知一个六边形内接于一条圆锥曲线，那么这个六边形对边的交点位于同一条直线上。
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