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。
The direction of the axis changes gradually so that it traces out a cone in space.
轴的方向逐渐在变，导致了轴的空间描绘出一个圆锥。
The H-project of a cone whose axis is parallel to V-plane is analysed.
分析了圆锥轴线为正平线时，在水平面投影图中轮廓线的投影。
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