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椭圆的长轴长、短轴长,以及双曲线的实轴长、虚轴长,我们统称为中心型二次曲线的轴长。对于一般中心型二次曲线
The long and short axis lengths of an ellipse, the real axis length of a hyperbola, and the length of an imaginary axis are collectively referred to as the axial length of a central quadratic curve. For general centered quadratic curves