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For the past five years,Paula Smith,a historian of science,has devoted herself to^1 recreating long-forgotten techniques......

1987—1990年的研究表明,红薯与绿豆间作只要方法得当,可实现红薯基本不减产,且每亩能多收40～50公斤绿豆,亩产值能增加60～70元。......

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