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礁 jiāo
gen.	crag
earth.sc.	reefs
tech.	rock
UN, geol.	reef
暗礁 jiāo
gen.	reef; rock
生物礁 jiāo
geol.	reef

礁: 697 phrases in 36 subjects

Agriculture	6
Architecture	8
Biology	2
Commerce	3
Construction	1
Desert science	16
Earth sciences	8
Ecology	5
Economy	2
Electronics	2
Engineering geology	20
Environment	4
Explosives and Explosive Ordnance Disposal	5
Fishery fishing industry	1
General	44
Geology	4
Hydroelectric power stations	29
Ichthyology	1
International trade	5
Life sciences	3
Management	1
Military	2
Name of organization	1
Nautical	1
Navigation	1
Oceanography & oceanology	3
Oil / petroleum	207
Religion	1
Shipbuilding	3
Soil science	1
Space	1
Technology	288
Textile industry	5
Transport	1
United Nations	10
Water resources	2