eu·phe·mism /ˈjufəˌmɪzəm/
  委婉的說法
  Eu·phe·mism n.  Rhet. A figure in which a harsh or indelicate word or expression is softened; a way of describing an offensive thing by an inoffensive expression; a mild name for something disagreeable.
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  euphemism
       n : an inoffensive expression that is substituted for one that
           is considered offensive [ant: dysphemism]