抛物线 Parabola
（重定向自Parabolic Equation）
抛物线是一种圆锥曲线。在一个平面内，抛物线的每一点Pi，其与一个固定点F之间的距离等于其与一条不经过此点F的固定直线L之间的距离。这固定点F叫做抛物线的「焦点」，固定直线L叫做抛物线的「准线」。
Parabolic Equation
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Parabola 抛物线
（重定向自Parabolic Equation）
A parabola (/pəˈræbələ/; plural parabolas or parabolae, adjective parabolic, from Greek:παραβολή) is a two-dimensional, mirror-symmetrical curve, which is approximately U-shaped when oriented as shown in the diagram below, but which can be in any orientation in its plane. It fits any of several superficially different mathematical descriptions which can all be proved to define curves of exactly the same shape.
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