infertility
  不肥沃,不毛
  in·fer·til·i·ty /ˌɪn(ˌ)fɝˈtɪlətɪ/ 名詞
  不育,不孕,不生育,不育症
  In·fer·til·i·ty n.  The state or quality of being infertile; unproductiveness; barrenness.
     The infertility or noxiousness of the soil.   --Sir M. Hale.
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  infertility
       n : the state of being unable to produce offspring; in a woman
           it is an inability to conceive; in a man it is an
           inability to impregnate [syn: sterility] [ant: fertility]