confirmative
  (a.)確定的;確實的
  Con·firm·a·tive a.  Tending to confirm or establish.
  -- Con*firm*a*tive*ly, adv.
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  confirmative
       adj : serving to support or corroborate; "collateral evidence"
             [syn: collateral, confirming, confirmatory, corroborative,
              corroboratory, substantiating, substantiative, validating,
              validatory, verificatory, verifying]