su·per·flu·i·ty /ˌsupɚ/
  多餘;奢侈品
  Su·per·flu·i·ty n.; pl. Superfluities
  1. A greater quantity than is wanted; superabundance; as, a superfluity of water; a superfluity of wealth.
     A quiet mediocrity is still to be preferred before a troubled superfluity.   --Suckling.
  2. The state or quality of being superfluous; excess. “By a superfluity abominable.”
  3. Something beyond what is needed; something which serves for show or luxury.
  Syn: -- Superabundance; excess; redundancy.
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  superfluity
       n : extreme excess; "an embarrassment of riches" [syn: overplus,
            plethora, embarrassment]