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Dr.YuanwasborninBeijingin1930.61hegraduatedfromSouthwes...
问题详情:Dr.YuanwasborninBeijingin1930.61hegraduatedfromSouthwestAgriculturalCollegein1953,hehasgivenhislifeto62(find)waystogrowmoreandmorerice.Asayoungman,hesawthegreatneedforincreasingthericeoutput.A...