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| 单词 | diamond-drill |
| 释义 | > as lemmasdiamond-drill diamond-drill n. (a) a drill armed with one or more diamonds used for boring hard substances; (b) a drill for boring rocks, having a head set with rough diamonds, a diamond-borer. ΚΠ 1827 E. Turrell in Gill's Technol. Repository 1 xxxiv. 129 Pierced by very fine diamond drills. 1881 E. Matheson Aid Bk. Engin. Enterprise Abroad 391 Diamond drills..will pierce the hardest known rocks. < as lemmas |
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