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主系统
avia.	major system
IT	main system
space	primary system
tech.	main engine remote control system
telecom.	host system; mother system
主系统【核】
el.	primary system
反应堆主系统核
el.	main primary system

主系统: 475 phrases in 54 subjects

Agriculture	3
Air defense	7
Anatomy	1
Architecture	1
Artificial intelligence	4
Automobiles	34
Aviation	99
Business	2
Commerce	1
Computer networks	4
Computers	1
Consulting	1
Corporate governance	1
Cryptography	3
Data processing	3
Desert science	1
Earth sciences	4
Ecology	1
Electric machinery	2
Electronics	54
General	3
Genetics	2
Geophysics	1
Horticulture	1
Household appliances	1
Information technology	15
International trade	1
Latin	1
Librarianship	1
Life sciences	3
Metallurgy	3
Missiles	1
Name of organization	6
Nautical	3
Navigation	1
Nuclear and fusion power	8
Oil / petroleum	2
Otorhinolaryngology	1
Plastic surgery	1
Project management	3
Racing and motorsport	1
Rail transport	3
Refrigeration	2
Reproductive biology	1
Shipbuilding	1
Solar power	1
Space	104
Sports	2
Steel production	1
Surgery	1
Technology	62
Telecommunications	6
Textile industry	2
Wind Energy	3