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BNC: 14719 COCA: 17328
unproductive
adjective /ˌʌnprəˈdʌktɪv/
  1. 1
    not achieving any benefits or positive results 没有益处的;没有结果的

    The search proved unproductive. 搜查没有任何结果。

     Synonyms and related words
    Unsuccessful: failed, abortive, fruitless...
  2. 2
    unproductive land is not good for growing crops on (土地)不宜耕种的,贫瘠的
     Synonyms and related words
    Crop farming: arable, broadacre, cash crop...
     Synonyms and related words
    Soil fertility and fertilization: compost, compost, desertification...

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