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бедрок

名词
强调
地质学 shelf; bed-rock; bedding rock; bedrock; ledge rock; shelf
矿业, 过时/过时 subterrane
黄金开采 placer rock bed (MichaelBurov); placer bedrock (MichaelBurov); placer bedding rock (MichaelBurov); placer rock floor (MichaelBurov)