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Geometry that is magnetic is round in nature. 磁性的幾何學性質上是球形的。
Nature provides no unoccupied gap between round and nonround shapes, so any boundary would be an arbitrary choice. 大自然竝未在正球形與非球形間設下明顯的界線，所以任何的邊界值都衹是人類恣意的選擇。