ar /ˈɑr/
  近似推理
  Ar conj. Ere; before. [Obs.]
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  Ar
       n 1: a colorless and odorless inert gas; one of the six inert
            gases; comprises approximately 1% of the earth's
            atmosphere [syn: argon, atomic number 18]
       2: a unit of surface area equal to 100 square meters [syn: are]
       3: a state in south central United States; one of the
          Confederate states during the American Civil War [syn: Arkansas,
           Land of Opportunity]