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natural background
el. 天然本底【核】
oil 天然背景
space 自然本底辐射
tech. 自然本底; 自然背景
wind. 天然本底
natural background
: 17 phrases in 9 subjects
Earth sciences1
Ecology1
Electronics1
Metallurgy1
Nuclear physics1
Space2
Sports1
Technology8
Wind Energy1

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