以上来源于: WordNet
This allows the bit to drill around a central cylinder of rock, which is taken in through the bit and into the core barrel.
这样允许钻头围绕岩石的中心圆柱体钻进,并通过钻头进入取芯桶。
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Several tons of rock had to be dug out of the ground just to make one barrel of oil.
NPR: Industry Seeks to Extract Oil from Rocky Mountain Shale
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