por·tent /ˈpɔrˌtɛnt, ˈpor-/
  前兆,預示,異常之物
  Por·tent n.  That which portends, or foretoken; esp., that which portends evil; a sign of coming calamity; an omen; a sign.
     My loss by dire portents the god foretold.   --Dryden.
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  portent
       n : a sign of something about to happen; "he looked for an omen
           before going into battle" [syn: omen, presage, prognostic,
            prognostication, prodigy]