bo·nan·za /bəˈnænzə/
  富礦帶,帶來好運的事物,幸運
  Bo·nan·za n.  In mining, a rich mine or vein of silver or gold; hence, anything which is a mine of wealth or yields a large income. [Colloq. U. S.]
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  bonanza
       n 1: an especially rich vein of precious ore
       2: a sudden happening that brings good fortune (as a sudden
          opportunity to make money); "the demand for testing has
          created a boom for those unregulated laboratories where
          boxes of specimen jars are processed lik an assembly line"
          [syn: boom, gold rush, gravy, godsend, manna from
          heaven, windfall, bunce]