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background level
agric.	背景层次
el.	本底水平【核】
eng.geol.	背景含量
met.	背底能级
oil	背景水平; 背景值; 本底值
tech.	本底水准
wind.	本底水平; 自然本底值
background noise level
el.mach.	基底噪声电平; 基底噪声级
background level Term used in a variety of situations, always as the constant or natural amount of a given substance, radiation, noise, etc.
environ.	背景级别 (此名词使用在多种情况，通常是指自然或者固定含量的某一给定物质、辐射、噪音等。)

background level: 16 phrases in 7 subjects

Automobiles	2
Desert science	2
Earth sciences	1
Electronics	1
Nautical	1
Space	1
Technology	8