directrix curve [数] 准曲线
directrix of a conic [数] 二次曲线的准线
scroll directrix 涡卷准线
directrix of cylinder 圆柱的准线
Directrix of a Parabola 抛物线准线 ; 定直线
以上来源于: WordNet
N a fixed reference line, situated on the convex side of a conic section, that is used when defining or calculating its eccentricity 准线 [geometry]
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