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1·An open curve formed by a plane that cuts the base of a right circular cone.

一个平面与正圆锥体的底部相交而形成的不闭合的曲线。

2·This article has extended a property of the right Angle chord of the circular cone curve to the general cases.

本文将圆锥曲线的直角弦的一个性质推广到了一般情形。