真: true; genuine; real二次: secondary; quadratic曲面: hook face; curve; curved sur ...超二次曲面: hyperquadric二次曲面: conicoid; quadaratic surface; quadratic surface; quadric surface; second degree surface二次曲面把: bundle of quadic; bundle of quadrics二次曲面列: range of quadrics二次曲面心: centre of quadric二次曲面的轴: axis of a quadric二次曲面模型: model of a quadric二维二次曲面: two dimensional quadric共焦二次曲面: confocal quadrics; confocal quardrics回转二次曲面: quadric of revolution; quafric of revolution绝对二次曲面: absolute quadric科希二次曲面: cauchy'squadric拉伸二次曲面: quadric of stretching; stretching quadric密切二次曲面: osculating quadric奇异二次曲面: singular quadric射影二次曲面: projective quadric伸长二次曲面: elongation quadric同心二次曲面: concentric quadrics退化二次曲面: degenerate quadric; improper quadric无心二次曲面: non central quadric; noncentral quadric一般二次曲面: general quadric surface异常二次曲面: improper quadric
