中美產量不能簡單比較。中國很多耕地耕種很多很多年，土地肥力下降。美國的耕地大塊更適合機械化

來源: FollowNature 於 2021-05-23 07:13:00 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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