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down hole
 down hole
dril. 井下
oil 井底
 | safety valve
 safety valve
avia. .安全阀; 安全活门
dril. 泄压阀
food.ind. 解压阀
oil 卸压安全阀
space 安全 阀
tech. 安全阀

to phrases
down hole
dril. 井下
oil 井底
down-hole
mining. 井下【下井】
down hole: 111 phrases in 12 subjects
Automobiles1
Drilling27
Earth sciences3
Electronics1
Engineering geology2
Explosives and Explosive Ordnance Disposal9
General1
Golf1
Hydroelectric power stations2
Mining5
Oil / petroleum36
Technology23

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