impermeability
  不能滲透的性質或狀態,不滲透性,不透過性
  im·per·me·abil·i·ty /(ˌ)ɪmˌpɝmɪəˈbɪlətɪ/ 名詞
  不滲透性,不穿透性
  Im·per·me·a·bil·i·ty n.  The quality of being impermeable.
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  impermeability
       n : the property of something that cannot be pervaded by a
           liquid [syn: impermeableness] [ant: permeability]