wanderer
 漫遊者,流浪者
 Wan·der·er n. One who wanders; a rambler; one who roves; hence, one who deviates from duty.
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 wanderer
      n 1: someone who leads a wandering unsettled life [syn: roamer,
            rover, bird of passage]
      2: a computer program that prowls the internet looking for
         publicly accessible resources that can be added to a
         database; the database can then be searched with a search
         engine [syn: spider]