... 二次曲线曲率 curvature of a conic 共焦二次曲线 cofocal conics; confocal conic sections; confocal conics 共轭二次曲线 conjugate conics; conjugate curve of the second order ...
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family of confocal conics 共焦二次曲线族
family of confocal centred conics [数] 共焦有心二次曲线族
confocal central conics [数] 共焦有心二次曲线
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