| 单词 | directrix |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔cone〕The surface generated by a straight line, the generator, passing through a fixed point, the vertex, and moving along a fixed curve, the directrix.锥面：由一条直线，即母线，通过一固定点，即顶点，沿一给定曲线，即准线，连续移动而产生的平面美国传统〔cylinder〕A solid bounded by two parallel planes and such a surface, especially such a surface having a circle as its directrix.圆柱体：由两个平行平面和这样的表面，特别是有一个圆作为其准线的平面所形成的柱体美国传统〔focus〕Mathematics A fixed point whose relationship with a directrix determines a conic section.【数学】 焦点：一个与准线的关系决定圆锥形状的定点美国传统〔right circular cone〕The surface generated by a generator passing through a vertex that lies on the perpendicular axis of a circular directrix.直立圆锥：由生成线穿过位于环形准线的垂直轴而生成的表面美国传统 |
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