中國生產力落後於歐洲是中世紀以後的事了，牛耕不是原因。馬鐙是東亞發明的。膚淺的借口是圖方便，真正的原因是思想。

來源: 十具於 2022-02-16 11:26:47 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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