AR的中文意思、音标与词形变化

[计] 应收款, 自动再启动, 辅助程式 [医] 紧急反应

n a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere n a unit of surface area equal to 100 square meters n a state in south central United States; one of the Confederate states during the American Civil War