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gas-free
met.	无气体的
tech.	不含气的
gas free
space	不含气的

gas-free: 59 phrases in 15 subjects

Automobiles	3
Aviation	1
Ecology	3
Electric machinery	1
Electronics	2
Explosives and Explosive Ordnance Disposal	1
General	1
Geology	1
Metallurgy	5
Nautical	1
Nuclear and fusion power	1
Oil / petroleum	22
Physics	1
Plastics	1
Technology	15