English ⇄ Chinese +

back system
expl.	备用系统

back system : 82 phrases in 34 subjects

Architecture	1
Automobiles	6
Aviation	1
Business	7
Chemistry	2
Desert science	1
Drilling	1
Earth sciences	1
Economics	2
Electricity	3
Electronic commerce	1
Electronics	3
Geotechnics	1
Horticulture	1
Hydroelectric power stations	1
Information technology	4
Law	1
Mechanics	1
Metallurgy	4
Mining	1
Nautical	3
Navigation	2
Nuclear physics	1
Oil / petroleum	3
Plastics	1
Securities	1
Space	7
Sports	1
Steel production	1
Technology	11
Telecommunications	1
Textile industry	4
Volleyball	2
Wind Energy	1