“Foraky boring method”的概念、定义、翻译、参考文献-科学参考

单词	Foraky boring method
释义	Foraky boring method [fǝ`räk·ē `bȯr·iŋ ´meth·ǝd] ^{MINING ENGINEERING} A percussive boring system; a closed- in derrick contains the crown pulley, over which a steel rope with the boring tools is passed from a drum; the drum moves the tools, which are vibrated by a walking beam.
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