“churn drill”的概念、定义、翻译、参考文献-科学参考

单词	churn drill
释义	churn drill [`chǝrn ´dril] ^{MECHANICAL ENGINEERING} Portable drilling equipment, with drilling performed by a heavy string of tools tipped with a blunt-edge chisel bit suspended from a flexible cable, to which a reciprocating motion is imparted by its suspension from an oscillating beam or sheave, causing the bit to be raised and dropped. Also known as American system drill; cable-system drill.
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