per·vi·ous /ˈpɝviəs/
  (a.)使通過的,讓過去的,可通的
  Per·vi·ous a.
  1. Admitting passage; capable of being penetrated by another body or substance; permeable; as, a pervious soil.
     [Doors] . . . pervious to winds, and open every way.   --Pope.
  2. Capable of being penetrated, or seen through, by physical or mental vision. [R.]
     God, whose secrets are pervious to no eye.   --Jer. Taylor.
  3. Capable of penetrating or pervading. [Obs.]
  4. Zool. Open; -- used synonymously with perforate, as applied to the nostrils or birds.
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  pervious
       adj : admitting of passage or entrance; "pervious soil"; "a metal
             pervious to heat" [ant: impervious]