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。
The mathematical model of typical saddle-shape weld was established, and the welding pose parameters were calculated with MATLAB.
针对典型的马鞍形焊缝进行数学建模，并利用MA TLAB软件计算焊接位姿参数。
The mathematical model of typical saddle-shape weld was established, and the welding pose parameters were calculated with MATLAB.
针对典型的马鞍形焊缝进行数学建模，并利用MATLAB软件计算焊接位姿参数。
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