n.

1. 背景（与前景foreground相对）[C]
   He took a picture of me with the pavilion in the background.

   他以那个亭子为背景给我照了一张相片。

2. （事件等的）背景，远因[C][U]
   This book gives the background of the Civil War.

   这本书叙述了南北战争的背景。

3. 出身背景；（包括学历在内的）经历[C][U]
   He came from an impoverished background.

   他出身贫寒。

4. （图样等的）底子[C]
5. 背景资料[U]
6. 隐蔽的地方，幕后[the S]
   She has a lot of power, but likes to remain in the background.

   她的权力很大，但是喜欢隐身幕后。

7. （干扰录音或无线电广播的）杂音[U]
8. 背景音乐[U]

n.

1. part of a scene, picture, or description that forms a setting for the main figures, events, etc.
2. the circumstances prevailing at a particular time or underlying an event.
   ▸a person's education, experience, and social circumstances.
3. a persistent low level of radioactivity, radiation, noise, etc. present in an environment.
4. tasks or processes running on a computer that do not need input from the user.

v.

1. form a background to.
2. put in the background.
3. provide with background information.