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main control
avia.	主控制器
desert.	主导制约因素
earth.sc.	总控制
tech.	主控
telecom.	主控制器

main control: 104 phrases in 28 subjects

Agriculture	1
Air defense	3
Automobiles	2
Aviation	11
Computers	1
Construction	1
Earth sciences	2
Electric machinery	2
Electronics	5
Engineering geology	1
General	1
Hydroelectric power stations	4
Information technology	1
Mathematics	1
Mechanics	1
Metallurgy	3
Nautical	2
Nuclear and fusion power	4
Oil / petroleum	2
Oil processing plants	2
Project management	1
Rail transport	3
Refrigeration	1
Shipbuilding	3
Space	12
Technology	31
Telecommunications	2
Wind Energy	1