n a person's social heritage: previous experience or training
n the part of a scene (or picture) that lies behind objects in the foreground
n information that is essential to understanding a situation or problem
n extraneous signals that can be confused with the phenomenon to be observed or measured
n relatively unimportant or inconspicuous accompanying situation
n the state of the environment in which a situation exists
n (computer science) the area of the screen in graphical user interfaces against which icons and windows appear
n scenery hung at back of stage
v understate the importance or quality of
n. 背景图片, 背景（background的复数形式）