“hammer drill”的概念、定义、翻译、参考文献-科学参考

单词	hammer drill
释义	hammer drill [`ham·ǝr ´dril] ^{MECHANICAL ENGINEERING} Any of three types of fast-cutting, compressed-air rock drills (drifter, sinker, and stoper) in which a hammer strikes rapid blows on a loosely held piston, and the bit remains against the rock in the bottom of the hole, rebounding slightly at each blow, but does not reciprocate.
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