mi·grant /ˈmaɪgrənt/
  候鳥,移居者
  Mi·grant n.
  1. A migratory bird, person, or other animal.
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  Mi·grant a.  Migratory. --Sir T. Browne.
  migrant
       adj : habitually moving from place to place especially in search
             of seasonal work; "appalled by the social conditions of
             migrant life"; "migratory workers" [syn: migratory]
       n : traveler who moves from one region or country to another
           [syn: migrator]