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空行
gen.	slow running
agric.	nullNUL (nullus)
busin.	white space
IT	null string
met.	free play
tech.	empty string; null line; space; white line

空行 : 721 phrases in 57 subjects

Advertising	1
Agriculture	6
Air defense	7
Architecture	1
Artificial intelligence	1
Automobiles	21
Aviation	175
Bridge construction	2
Business	12
Cartography	1
China	3
Company name	1
Computer numerical control	1
Computers	1
Construction	2
Dancing	1
Earth sciences	7
Economy	8
Electric machinery	2
Electronics	33
Engineering geology	1
Environment	4
Exhibitions	1
Explosives and Explosive Ordnance Disposal	1
Finances	3
General	57
German	2
Hydroelectric power stations	3
Information technology	3
International Monetary Fund	1
International trade	8
Librarianship	1
Metallurgy	1
Military	1
Name of organization	2
Nautical	1
Oil / petroleum	4
Outdoor activities and extreme sports	3
Polygraphy	6
Project management	3
Rail transport	6
Refrigeration	2
Remote sensing	1
Securities	6
Shipbuilding	4
Skydiving	14
Space	184
Sports	2
Technology	71
Telecommunications	10
Textile industry	7
Transport	4
United Nations	1
United States	11
Water resources	1
Wind Energy	3
Work flow	2