Maps (on paper or on the screen) are flat surfaces; they require a transformation from the curved surface of the earth to the flat plane: a map projection.
纸上或屏幕上的地图是平面的；它们需要从地球的曲面向平面进行转换：地图投影。
Does this mean space is shaped like a flat plane, a sphere or a saddle?
是不是这就意味着宇宙的形状就是平面、封闭球体或者马鞍状？
A sphere cannot be represented on a flat plane without distortion, which means all map projections distort in one way or another.
球体在平面上不进行扭曲就无法表现出来，这意味着所有制图方式都会以某种方式出现扭曲。
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