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天空 tiānkōng
gen.	the blue blanket; firmament; urano; vault
agric.	celestial
archit.	high
desert.	heaven
hydroel.st.	welkin
repr.biol.	urano-
space	Ohzora (日本高层大气探测卫星)
sport.	sky; canopy; air

天空: 1228 phrases in 53 subjects

Agriculture	10
Air defense	26
Animal husbandry	2
Architecture	3
Artificial intelligence	1
Automobiles	3
Aviation	250
Business	3
Cartography	2
China	2
Desert science	4
Drilling	1
Earth sciences	26
Ecology	2
Economy	5
Electronics	66
Environment	1
Exhibitions	1
French	6
General	35
Geology	1
German	6
Household appliances	1
Information technology	2
International trade	1
Italian	3
Latin	1
Metallurgy	4
Military	1
Multimedia	1
Name of organization	1
Nautical	2
Nuclear and fusion power	1
Nuclear physics	1
Oil / petroleum	5
Oil processing plants	1
Portuguese	2
Radio	1
Rail transport	2
Refrigeration	4
Remote sensing	2
Reproductive biology	2
Shipbuilding	1
Space	446
Spanish	1
Technology	123
Telecommunications	3
Textile industry	2
Transport	1
United Nations	2
United States	147
Weapons of mass destruction	1
Wind Energy	7