背50斤的面比背50斤的人沉，哈哈，是因为面袋子是集中一处（肩上），而人的重量是分散的吧？

来源: FionaRawson 于 2021-04-24 20:28:35 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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