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坚硬岩
hydroel.st.
hard rock
tech.
ledger rock
;
sound rock
(石)
坚硬岩:
42 phrases
in 8 subjects
Architecture
1
Drilling
3
Engineering geology
7
Explosives and Explosive Ordnance Disposal
6
General
2
Hydroelectric power stations
2
Oil / petroleum
2
Technology
19
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