as·sas·sin /əˈsæsṇ/
 暗殺者,刺客
 As·sas·sin n.  One who kills, or attempts to kill, by surprise or secret assault; one who treacherously murders any one unprepared for defense.
 As·sas·sin, v. t. To assassinate. [Obs.]
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 assassin
      n 1: a murderer (especially one who kills a prominent political
           figure) who kills by a treacherous surprise attack and
           often is hired to do the deed; "his assassins were
           hunted down like animals"; "assassinators of kings and
           emperors" [syn: assassinator, bravo]
      2: a member of a secret order of Muslims (founded in the 12th
         century) who terroriszed and killed Christian Crusaders