Only in a flat universe does space obey all the standard geometry-class rules-the angles of a triangle add up to exactly 180 degrees and parallel lines never meet.
只有在平坦的宇宙中，空间才符合标准的几何规律——三角形的内角和精确地等于180度，平行线永远不相交。
Parallel lines will never meet no matter how far extended.
相平行的线不管延伸多长，永远都不会相交。
Man and woman are two parallel lines, and it is the nature of parallel lines never to meet.
男人与女人是两条平行线。两条平行线是不会相交的。
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