ex·tra·di·tion /ˌɛkstrəˈdɪʃən/
  引渡逃犯,將亡命者送還本國
  Ex·tra·di·tion n.  The surrender or delivery of an alleged criminal by one State or sovereignty to another having jurisdiction to try charge.
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  extradition
       n : the surrender of an accused or convicted person by one state
           or country to another (usually under the provisions of a
           statute or treaty)