knight-er·rant /ˈnaɪtˈɛrənt/
  中世紀的
  Knight-er·rant n.; pl. Knight-errants, or Knights-errant. A wandering knight; a knight who traveled in search of adventures, for the purpose of exhibiting military skill, prowess, and generosity.
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  knight-errant
       n : a wandering knight travelling in search of adventure