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坚硬层
eng.geol. stiff layer
oil pycnotheca
tech. solid bed
坚硬 层
: 23 phrases in 10 subjects
Agriculture1
Automobiles2
Bridge construction1
Drilling6
Engineering geology2
Explosives and Explosive Ordnance Disposal1
General1
Hydroelectric power stations1
Oil / petroleum4
Technology4

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