| 释义 |
抛物线pāowùxiàn平面上到定点O和定直线l距离相等的动点P的轨迹。定点O叫做抛物线的焦点。将一物体向上斜抛出去所经的路线就是抛物线。{parabola; plane curve formed by the intersection of a right circular cone with a plane parallel to a generator of the cone; trail described by the point P when it moves on a plane to the fixed-point O at an equal distance to the fixed straight line l, with O serving as the parabola's focus. The arc described by an object when it is thrown from one spot to another is also a parabola.} |