abbr. 高级数据显示系统（Advanced Data Display System）；美国陆军数据分发系统；应用数字数据系统（Applied Digital Data System）

n a condition (mostly in boys) characterized by behavioral and learning disorders

v make an addition (to); join or combine or unite with others; increase the quality, quantity, size or scope of

v state or say further

v bestow a quality on

v make an addition by combining numbers

v determine the sum of

v constitute an addition