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垢 gòu
dril.	scale
盐水垢 gòu
mining.	scales

垢: 905 phrases in 49 subjects

Agriculture	7
Animal husbandry	12
Architecture	48
Automobiles	52
Aviation	2
Bridge construction	1
Business	1
Chemistry	45
Compressors	12
Computer numerical control	1
Construction	4
Continuous casting	2
Cosmetics and cosmetology	1
Dentistry	1
Dermatology	2
Drilling	22
Earth sciences	3
Ecology	11
Economy	3
Electric machinery	2
Electronics	57
Engineering geology	8
Environment	1
Forestry	1
General	92
Genetics	1
Hydroelectric power stations	3
Life sciences	3
Metallurgy	50
Mining	1
Nautical	8
Nuclear and fusion power	1
Nursing	3
Oil / petroleum	87
Oil processing plants	2
Otorhinolaryngology	5
Plastics	4
Polymers	5
Refrigeration	7
Reproductive biology	1
Shipbuilding	10
Space	3
Steel production	1
Technology	290
Textile industry	20
Transport	1
United Nations	1
Water resources	4
Wind Energy	3