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free electron stresses
tech.	несвязанный электрон; свободный электрон

free-electron : 86 phrases in 17 subjects

Air defense	2
Chemistry	1
Electronics	8
Energy industry	1
General	1
Household appliances	2
Lasers	9
Makarov	19
Mass media	4
Medical appliances	1
Metallurgy	7
Military	3
Nanotechnology	4
Physics	6
Semiconductors	2
Space	4
Technology	12