| 单词 | rock drill |
| 释义 | rock drill (once / 200328 pages) n WORD FAMILY rock drill: rock drills USAGE EXAMPLESThe expedition will use new types of rock drill developed in the UK and Germany to retrieve cores from up to 80m below the seabed. BBC(Oct 22, 2015) The rock drill was spun at a scientific waypoint known as "The Kimberley". BBC(Apr 30, 2014) Our correspondent says that most of the people taking part in the strike work deep underground as rock drill operators. BBC(Jan 23, 2014) n a drill for penetrating rock Syn|Hypo|Hyper bore bit, borer, 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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