为了证明这个定理，我们假定这个圆G能按上述方式画在一个球面上。
To prove the theorem we shall suppose that the graph G is drawn on a sphere as described above.
针对球面、立方体全景图获取比较困难等缺点，提出一种基于灭点圆的柱面全景图漫游方法。
Aiming at the shortcomings of obtaining spherical and cubic panorama, the technique of tour into the cylindrical panorama based on vanishing circle is proposed in this paper.
根据“球面上圆构造椭圆锥面”的原理，设计了球内接三通接头。
According to the principle of constructing elliptical conical surface by the circles on a sphere, a T-joint inscribed in a sphere is designed.
根据球面形成原理，利用铣刀和工件的两个圆运动，合成球头碗的不完整内球面。
According to the forming principal of spherical surface, inner spherical surface of the spherical hinge is formed utilizing the circular motion of work piece and milling cutter.
根据球面形成原理，利用铣刀和工件的两个圆运动，合成球头碗的不完整内球面。
According to the forming principal of spherical surface, inner spherical surface of the spherical hinge is formed utilizing the circular motion of work piece and milling cutter.
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