pass·port /ˈpæsˌport, ˌpɔrt/
  護照,手段,通行證
  Pass·port n.
  1. Permission to pass; a document given by the competent officer of a state, permitting the person therein named to pass or travel from place to place, without molestation, by land or by water.
     Caution in granting passports to Ireland.   --Clarendon.
  2. A document carried by neutral merchant vessels in time of war, to certify their nationality and protect them from belligerents; a sea letter.
  3. A license granted in time of war for the removal of persons and effects from a hostile country; a safe-conduct.
  4. Figuratively: Anything which secures advancement and general acceptance.
     His passport is his innocence and grace.   --Dryden.
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  passport
       n 1: any authorization to pass or go somewhere; "the pass to
            visit had a strict time limit" [syn: pass]
       2: a document issued by a country to a citizen allowing that
          person to travel abroad and re-enter the home country
       3: any quality or characteristic that gains a person a
          favorable reception or acceptance or admission; "her
          pleasant personality is already a recommendation"; "his
          wealth was not a passport into the exclusive circles of
          society" [syn: recommendation]