The hyperbolic surface, which has so-called negative curvature because its surface curves up and down at the same time, like a saddle.

双曲曲面，即通常所称的负曲率，因为它的表面同时向上和向下弯曲，就像一个马鞍。

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The hyperbolic surface, which has so-called negative curvature because its surface curves up and down at the same time, like a saddle, just might represent the shape of the universe.

双曲表面，即通常所称的负曲率，因为它的表面曲线同时有的向上和有的向下，像一个马鞍，也许这样就可以代表宇宙的形状。

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This paper explores three ruled surfaces geometry properties about columnar surface, cone surface and hyperbolic parabobid.

研究建筑上常用的柱状面、锥状面和双曲抛物面等不可展直纹曲面的几何性质。

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This paper explores three ruled surfaces geometry properties about columnar surface, cone surface and hyperbolic parabobid.

研究建筑上常用的柱状面、锥状面和双曲抛物面等不可展直纹曲面的几何性质。

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