backgrounder记者招待会backgroundn.背景；经历；幕后；后景vt.提供背景background elimination背景去除background restraining背景抑制background mathematics基础数学background block error背景误块background loudspeaker背景扬声器,电视拌音扬声器,背景声扬声器background compensator底色补偿器Background of Creation产生背景background electrolyte本底电解质Background Lock Toggle背景锁定开关background irradiation本底辐射