AA：活动年度

“Active Annual”常简写为“AA”，以简化书写和使用过程，提高效率。该缩写广泛应用于社会领域及各类会议场景中。其对应的中文含义为“活动年度”，通常指代某项活动从开始到结束的完整周期。

Effects of salt stress on the metabolism of active oxygen in seedlings of annual halophyte Glycine soja
盐胁迫对一年生盐生野大豆幼苗活性氧代谢的影响
Under the condition that few institutes could last long at that time, History Society of Yenching University had kept active for 14 years, published 12 issue Historical Annual, and gave very brilliant shows in the academic joint campaign in north China.
在当时很多学会大多无法长久坚持的情况下，这个学会却存在了14年之久，连续出版了12期的《史学年报》，并在北方史界联合的活动中表现非常活跃。
He was active in the anti-apartheid movement on campus and gave a speech at the annual dinner hosted by the Black Law Students Association.
校园里，他是反种族隔离运动的积极分子并且在由黑人学生法律协会举办的年会上做了演讲。
Results : The prevalence of active pulmonary tuberculosis in 2000 was 2 067 / 100 000.There was rising tendency from 1978 to 1990 and the annual growth rate was 1.9 %, while there was decreasing tendency from 1990 to 2000 and the annual decreasing rate was 2.6 %.
结果：活动性肺结核患病率2000年高达2067/10万，1978年~1990年12年间呈上升趋势，平均年递增率为1.9%，1990年~2000年10年间有所下降，平均年递降率为2.6%。

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