Directory listing for /srtsegjoin/1909年，美国农业局土壤局长富兰克林·金来中国，就是想弄清楚：没有化肥农药，中国怎么用这么少的土地养活了这么多人？他的研究结论后来被翻译成《四千年农夫》——那个_cn_audio/

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