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来源:雅诚德英语网
Space can have positive curvature, like the surface of a sphere, or negative curvature, like the surface of a saddle.
空间可以向球面一样有正的曲率,也可以像马鞍面一样有负的曲率。
Space can have positive curvature, like the surface of a sphere, or negative curvature, like the surface of a saddle.
空间可以向球面一样有正的曲率,也可以像马鞍面一样有负的曲率。