melting pot
  坩鍋,鎔爐;各民族融會之國
  Melt·ing pot n.
  1. A vessel in which anything is melted; a crucible.
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  melting pot
       n 1: an environment in which many ideas and races are socially
            assimilated
       2: a vessel made of material that does not melt easily; used
          for high temperature chemical reactions [syn: crucible]