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minimum level
libr.	微量级

minimum level: 66 phrases in 20 subjects

Aviation	7
Business	2
Commerce	1
Communications	1
Desert science	1
Earth sciences	5
Economy	2
Electronics	12
Engineering geology	1
Explosives and Explosive Ordnance Disposal	1
Fishery fishing industry	2
Food industry	1
Hydroelectric power stations	5
Information technology	1
Rail transport	1
Securities	1
Space	3
Technology	16
Textile industry	2
Water resources	1