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off-on
gen.	断开-接通; 断-通; 关-开; 启闭; 键控的

off-on: 512 phrases in 57 subjects

Agriculture	11
Air defense	6
Animal husbandry	1
Architecture	2
Artificial intelligence	1
Astronautics	1
Athletics	2
Automatic control	1
Automobiles	41
Aviation	12
Boxing	1
British usage, not spelling	1
Business	28
Chemistry	5
Commerce	10
Compressors	3
Computer numerical control	1
Construction	3
Cosmetics and cosmetology	1
Dermatology	1
Drilling	6
Ecology	2
Economy	9
Electric machinery	5
Electronics	33
Engineering geology	2
Explosives and Explosive Ordnance Disposal	1
General	29
Geophysics	3
Hydroelectric power stations	3
Information technology	5
International trade	27
Lighting other than cinema	2
Logistics	3
Management	1
Mathematics	1
Metallurgy	19
Multimedia	1
Nautical	7
Navigation	1
Nuclear and fusion power	1
Oil / petroleum	14
Plastics	1
Power system protection	1
Racing and motorsport	1
Rail transport	3
Refrigeration	9
Shipbuilding	10
Space	30
Sports	3
Steel production	1
Technology	120
Telecommunications	5
Textile industry	12
Transport	3
Wind Energy	5
Wushu	1