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油底
geol.	oil down to

油底: 370 phrases in 32 subjects

Animal husbandry	1
Architecture	8
Automobiles	90
Aviation	1
Bridge construction	2
Chemistry	3
Commerce	2
Compressors	2
Construction	2
Drilling	5
Earth sciences	4
Economy	1
Engineering geology	1
Environment	1
General	8
Geology	3
Hydroelectric power stations	2
International trade	3
Mechanics	2
Metallurgy	5
Mining	3
Nautical	11
Navigation	5
Oil / petroleum	46
Oil processing plants	2
Polygraphy	1
Polymers	1
Racing and motorsport	4
Rail transport	1
Shipbuilding	6
Technology	140
Textile industry	4