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第二级 dì’èrjí
avia.	second stage
earth.sc.	second
tech.	secondary; second order; second-stage

第二级: 83 phrases in 23 subjects

Agriculture	4
Automobiles	3
Aviation	1
Business	1
Earth sciences	3
Economy	8
Electronics	9
General	5
International trade	2
Life sciences	1
Mathematics	2
Metallurgy	7
Multimedia	1
Oil / petroleum	1
Project management	1
Refrigeration	1
Securities	2
Space	7
Sports	2
Statistics	2
Submarines	1
Technology	18
Water resources	1