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down-hole

mining. 井下【下井】
down hole
dril. 井下
oil 井底
down-hole
: 119 phrases in 14 subjects
Automobiles1
Drilling27
Earth sciences3
Electronics1
Engineering geology2
Explosives and Explosive Ordnance Disposal9
General1
Geotechnics5
Golf1
Hydroelectric power stations2
Mineralogy3
Mining5
Oil / petroleum36
Technology23

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