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 kvass /ˈkvɑs, ˈkfɑs/
 裸麥啤酒

 kvass n.  A thin, sour beer, made by pouring warm water on rye or barley meal and letting it ferment, -- much used by the Russians. [written also quas and quass.]
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 Quass n.  A thin, sour beer, made by pouring warm water on rye or barley meal and letting it ferment, -- much used by the Russians.  Called also kvass. [written also kvass and quas.]
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 kvass
      n : fermented beverage resembling beer but made from rye or
          barley