n.
a person's social heritage: previous experience or training
"he is a lawyer with a sports background"
the part of a scene (or picture) that lies behind objects in the foreground
"he posed her against a background of rolling hills"
同义词：ground
information that is essential to understanding a situation or problem
"the embassy filled him in on the background of the incident"
同义词：background knowledge
extraneous signals that can be confused with the phenomenon to be observed or measured
"they got a bad connection and could hardly hear one another over the background signals"
同义词：background signal
relatively unimportant or inconspicuous accompanying situation
"when the rain came he could hear the sound of thunder in the background"
the state of the environment in which a situation exists
同义词：settingscope
(computer science) the area of the screen in graphical user interfaces against which icons and windows appear
同义词：desktopscreen background
scenery hung at back of stage
同义词：backdropbackcloth
