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 CA
 計算機代數

 Ca
      n 1: a white metallic element that burns with a brilliant light;
           the fifth most abundant element in the earth's crust; an
           important component of most plants and animals [syn: calcium,
            atomic number 20]
      2: a state in the western United States on the Pacific; the 3rd
         largest state; known for earthquakes [syn: California, Golden
         State, Calif.]