American Railway Association美国铁路协会 Agricultural Research Administration农业科研管理工作 acetyiene reduction activity乙炔还原活性 Assigned Responsible Agency指定负责机构 American Rental Association美国出租协会 Academic Research Alliance学术研究的联盟 Agricultural Retailers Association农业零售商协会 Average Response Amplitude平均响应幅度 Aircraft Rescue Association飞机救援协会 African Railway Association非洲铁路协会 Airborne Radar Attachment机载雷达附件 Antenna Research Associates天线的研究伙伴 Annual Review of Agriculture年度回顾的农业 American Revenue Association美国税务局协会 Annual Review of Anthropology (journal)于《人类学期刊年度回顾》(杂志)