名詞 ar:

1. a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
   同義詞：argon, Ar, atomic number 18
2. a unit of surface area equal to 100 square meters
   同義詞：are, ar
3. a state in south central United States; one of the Confederate states during the American Civil War
   同義詞：Arkansas, Land of Opportunity, AR

ARS
abbr.（略語）
Agricultural Research Service.
農(nóng)業(yè)研究局