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环周期
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环周期: 65 phrases in 25 subjects

Agriculture	1
Air defense	1
Aviation	6
Bridge construction	1
Business	1
Commerce	5
Compressors	1
Drilling	1
Ecology	2
Economy	2
Electronics	5
Explosives and Explosive Ordnance Disposal	2
Finances	2
International trade	1
Mathematics	1
Mechanics	1
Metallurgy	2
Nautical	1
Oil / petroleum	3
Quality control and standards	1
Space	2
Statistics	4
Technology	15
Telecommunications	1
Textile industry	3