All objects in a three-dimensional world can be simplified by smoothing out their shape to look like either a two-dimensional sphere (otherwise known as a circle) or a two-dimensional torus with however many holes necessary.
All objects in a three-dimensional world can be simplified by smoothing out their shape to look like either a two-dimensional sphere (otherwise known as a circle) or a two-dimensional torus with however many holes necessary.
所有三维世界的物体都能被简化看作是一个二维球面（也可称为一个圈），而任何带洞的物体则可以看作是曲面。