| 单词 | single-jack |
| 释义 | > as lemmassingle-jack single-jack n. North American a short hammer used in percussive hand-drilling by one person alone. ΚΠ 1961 Press (Vancouver) 1 Sept. 11 The mechanization of mines in 1890—the replacing of hand-steel, single-jack and double-jack, by drilling machines—had created new problems. < as lemmas |
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