conic section
柯林斯詞典
1. 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; ee = 1 for a parabola; e>1 for a hyperbola 圓錐曲線 (Often shortened to conic)
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