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隐伏煤田
tech. concealed coal field
隐伏煤田含煤岩系出露极差且大部或全部被掩盖,地面地质填图难以确定其边界的煤田
expl. concealed coalfield
隐伏煤田
: 2 phrases in 1 subject
Explosives and Explosive Ordnance Disposal2