依相對論而言時空或平行維度；"抽象"亦可理解為"間接"(速度x時間=距離)：如天文光年

來源: 沁文----古來客於 2014-11-30 15:24:46 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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