hardrock miner apprentice 硬岩矿工学徒
hardrock miner 硬岩矿工
hardrock mines 哈德罗克矿区
hardrock slope 硬岩边坡
Deep-buried hardrock tunnels 深埋硬岩隧道
ADJ (of mining) concerned with extracting minerals other than coal, usually from solid rock (采矿业)关心从硬石头中提炼矿物，而不是煤炭的
N a tough uncompromising man 硬汉子 [slang]
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