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hole bottom
expl. 孔底
tech. 钻孔底; 炮眼底
hole bottom
: 315 phrases in 13 subjects
Bridge construction1
Compressors1
Drilling90
Earth sciences8
Engineering geology2
Explosives and Explosive Ordnance Disposal6
General1
Geophysics10
Hydroelectric power stations1
Mining45
Oil / petroleum92
Technology57
Thermal Energy1

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