sub·aquat·ic /-əˈkwɑtɪk, ˈkwæ-/
  (a.)半水生的
  Sub·a·quat·ic Sub·a·que·ous a.
  1. Being under water, or beneath the surface of water; adapted for use under water; submarine; as, a subaqueous helmet.
  2. Geol. Formed in or under water; as, subaqueous deposits.
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  subaquatic
       adj 1: growing or remaining under water; "viewing subaqueous fauna
              from a glass-bottomed boat"; "submerged leaves" [syn:
              subaqueous, submerged, submersed, underwater]
       2: partially aquatic; living or growing partly on land and
          partly in water; "a marginal subaquatic flora" [syn: semiaquatic]