画法几何学中的难点之一是求解两一般位置二次曲面的交线。
One of difficulties in descriptive geometry theories is to draw the intersection created by two general position intersecting quadric surfaces.
一个曲面和平行于射影平面的一个平面的交线到某个平面的射影。
The projection onto a plane of the intersection of a surface with a plane parallel to the projection plane.
轮齿与其分度圆柱面的交线在分度圆柱面所展开的矩形中为圆弧；
The line, at which the tooth intersects the graduated cylinder, is an arc in the developed surface of the cylinder.
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