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background; contrast value | |||
background level; background value |
背 景值 : 27 phrases in 8 subjects |
Earth sciences | 4 |
Ecology | 4 |
Electronics | 1 |
Engineering geology | 3 |
Explosives and Explosive Ordnance Disposal | 1 |
Space | 1 |
Technology | 12 |
Water resources | 1 |