翻译:二次曲线的准线 同义词1)directrix of a conic,二次曲线的准线2)curvature of a conic,二次曲线的曲率3)diameter of a conic,二次曲线的直径4)centre of a conic,二次曲线的心5)axis of a conic,二次曲线的轴6)curvilinear regression of second degree,二次曲线的回归