假設老槍屁股處摩擦力為零，這腿上300公斤，背上也300公斤，還真的100斤擔子走200裏山路不用換肩

來源: 500miles 於 2025-09-17 08:36:29 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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