“core drill”的概念、定义、翻译、参考文献-科学参考

单词	core drill
释义	core drill [`kȯr ´dril] ^{MECHANICAL ENGINEERING} A mechanism designed to rotate and to cause an annular-shaped rock-cutting bit to penetrate rock formations, produce cylindrical cores of the formations penetrated, and lift such cores to the surface, where they may be collected and examined.
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