background
/ˈbækgraʊnd/noun
1
- in sing. the area or scenery behind the main object of contemplation, especially when perceived as a framework for it背景：
the house stands against a background of sheltering trees.
这房子映衬着浓荫蔽日的大树。
1.1
- the part of a picture or design that serves as a setting to the main figures or objects, or appears furthest from the viewer（画或设计的）后景; 背景：
the background shows a landscape of domes and minarets
背景展现的是穹顶和宣礼塔构成的景观
the word is written in white on a red background.
该字用白颜色写在红底上。
1.2
- a position or function which is not prominent or conspicuous幕后; 隐退状态：
after that evening, she remained in the background.
那晚之后, 她就一直退居幕后。
2
- the general scene, surroundings, or circumstances背景情况：
the events occurred against a background of continuing civil war.
这些事发生在持续内战的情况下。
2.1
- a person's education, experience, and social circumstances（学历、经历等）个人背景：
she has a background in nursing
她有过护理经验
a mix of students from many different backgrounds.
一批背景各异的学生。
2.2
- the circumstances, facts, or events that influence, cause, or explain something局势; 背景：
the political and economic background
政治经济局势
as modifier background information.背景资料。
3
- a persistent level of some phenomenon or process, against which particular events or measurements are distinguished, in particular本底, 基底, 尤指：
3.1
- Physics lowintensity radiation from radioisotopes present in the natural environment【物理】本底辐射。
3.2
- unwanted signals, such as noise in the reception or recording of sound外来杂音。
4
- Computing used to describe tasks or processes running on a computer that do not need input from the user【计算机】后台：
programs can be left running in the background
程序可在后台运行
as modifier background processing.后台处理。