pa·rab·o·la /pəˈræbələ/
拋物線
parabola
拋物線
Pa·rab·o·la n.; pl. Parabolas Geom. (a) A kind of curve; one of the conic sections formed by the intersection of the surface of a cone with a plane parallel to one of its sides. It is a curve, any point of which is equally distant from a fixed point, called the focus, and a fixed straight line, called the directrix. See Focus. (b) One of a group of curves defined by the equation y = ax
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parabola
n : a plane curve formed by the intersection of a right circular
cone and a plane parallel to an element of the curve