定直线 dìngzhíxiàn directrix Definitions Defs Origin Strokes Stroke Words Sentences Sents 定直线 定直線 dìngzhíxiàn directrix the fixed straight line used to define a conic section, such as a parabola
定直线 定直線 dìngzhíxiàn directrix the fixed straight line used to define a conic section, such as a parabola
