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真空系统 zhēnkōng xìtǒng
avia.	vacuum
space	vacuum system
tech.	vacuum and sub-atmospheric system

真空系统: 104 phrases in 19 subjects

Animal husbandry	1
Architecture	1
Automobiles	4
Aviation	16
Chemistry	1
Construction	2
Earth sciences	1
Ecology	1
Electronics	15
Engineering geology	1
General	3
Metallurgy	7
Nuclear and fusion power	1
Oil / petroleum	1
Oil processing plants	4
Refrigeration	3
Space	7
Technology	34
United States	1