work principle

: 40 phrases in 17 subjects

Bridge construction	5
Business	3
Chemistry	1
China	5
Commerce	1
Economics	2
Explosives and Explosive Ordnance Disposal	1
General	1
Hydroelectric power stations	2
Law	1
Management	1
Metallurgy	1
Physics	1
Scientific	1
Space	1
Sports	2
Technology	11