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中国古代引进新作物多长时间能全国普遍种植？ - 知乎
source link: https://www.zhihu.com/question/35401540/answer/770569141
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以烟草为例。烟草的早期传入主要有两条路线——从菲律宾到福建和从日本、朝鲜到辽东。（还有蒙古和缅甸两…
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