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- Conic sections and quadric surfaces. 二次曲线与二次曲面。
- A ratio describing the shape of a conic section. 描述圆锥曲线部分形状的比率。
- Motion of planets and comets in conic sections; Kepler's laws. 在锥截面上的行星与彗星的运动;开普勒定律。
- The platonic school's most significant discovery was the conic sections. Plato学派的最重要发现是圆锥曲线。
- His chief work was on the conic sections but he also wrote on other subjects. 他的主要著作是关于圆锥线的，但也写过其他方面的著作。
- Key words: Unity of geometry and algebra, conic sections, latus rectum. 关键词：数形合一，圆锥截痕，正焦弦。
- A fixed point whose relationship with a directrix determines a conic section. 焦点一个与准线的关系决定圆锥形状的定点
- Conic sections of different kind are projection graph, in which there are possibility to set perspective construction. 所有二次曲线皆为射影形,它们之间存在建立透射结构的可能性。
- GPLconx - GPLconx is an educational visualization tool that allows exploration of lines and conic sections in three models of 2-D hyperbolic geometry. GPLconx是一个教学可视化工具,可以观看2D双曲线几何体的三种模型的线条和二次曲线部分。
- The fixed curve traversed by a generatrix in generating a conic section or a cylinder. 准线穿过产生圆锥部分或圆柱的母线而形成的固定曲线
- Rsstriction of3- D fan blade governing the form of several conic sections is performed by using CG theory. The blade accuracy is therefore improved and the development simplified. 对给出的有限个锥形截面表示的三元流叶片，利用计算机图形学理论重新在三维空间进行了重构，从而提高了叶片展开的精度，简化了展开方法。
- A conic section whose plane is not parallel to the axis, base, or generatrix of the intersected cone. 圆锥的一部分，其切面既不平行于轴和基面，也不平行于圆锥母线
- "Closed curve, one of the conic sections of analytic geometry, consisting of all points whose distances from each of two fixed points (foci) add up to the same value. 解析几何中圆锥截线的一条封闭曲线,包含了与两个定点(焦点)之距离呈等值增加的所有点。
- A conic section whose plane is not parallel to the axis,base,or generatrix of the intersected cone. 圆锥的一部分，其切面既不平行于轴和基面，也不平行于圆锥母线
- According to the fUndamental theorem of coniC In projective geometry any five points can decide one conic section. 在射影几何中，二次曲线定理告诉我们任意五点可以决定一条二次曲线。
- The ratio of the distance of any point on a conic section from a focus to its distance from the corresponding directrix. This ratio is constant for any particular conic section. 离心率二次曲线上任何一点到焦点的距离与到准线的距离之比对任一特定二次曲线来说，这个比值都是一个常数
- Given a hexagon inscribed in a conic section, the three pairs of the continuations of opposite sides meet on a straight line, called the Pascal line. 已知一个六边形内接于一条圆锥曲线，那么这个六边形对边的交点位于同一条直线上。
- According to the perspective character of conic sections, this paper analyses the condition setting perspective construction and the construction form of typical positions, Therefore, the homologous thread drawing is advanced. 本文从二次曲线问透射性质,分析了建立透射结构的条件,以及各种典型位置的透射结构形式,从而提出了对应曲线的作图。
- The ratio of the distance of any point on a conic section from a focus to its distance from the corresponding directrix.This ratio is constant for any particular conic section. 离心率二次曲线上任何一点到焦点的距离与到准线的距离之比对任一特定二次曲线来说，这个比值都是一个常数
- A conic section. 圆锥部分
