球體，東西向直徑隨緯度是變化的，赤道上可以走一萬公裏，南北極就是兩個點，一萬公裏是原地轉圈。

來源: 偶爾短路於 2025-12-21 18:48:36 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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