| 单词 | bore bit |
| 释义 | bore bit (extremely rare) n WORD FAMILY bore bit n a drill for penetrating rock Syn|Hypo|Hyper borer, rock drill, stone drill cross bit a rock drill having cruciform cutting edges; used in mining star drilla steel rock drill with a star-shaped point that is used for making holes in stones or masonry; it is operated by hitting the end with a hammer while rotating it between blows straight flute, straight-fluted drilla rock drill with flutes that are straight drill a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows) |
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