二次曲线
conic
Quadratic curve
conic curve
quadratic curves
quafric curve
secondary curve
second degree curve
Conics
Quadric curve
conic section
quadratic equation
conic sections
quadric curves
conical section
conies
the second-order curve
curve of second degree
curve of second order
二次曲线逼近法
Secon d curve near way
Second curve near way