| 单词 | jackhammer drill |
| 释义 | > as lemmasjackhammer drill A portable powered (typically pneumatic) drill with a sharp bit for breaking up hard surfaces. Also (and in earliest use) more fully jackhammer drill. ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > drill > power drills > percussion drills pneumatic drill1861 percussion drill1871 road drill1907 hammer drill1908 piston drill1910 jackhammer1912 1912 Financial Times 4 Jan. 6/7 An air compressor of 20 drill capacity has recently been added to the plant, and Ingersoll Rand Jack Hammer drills are being started underground. 1930 Engineering 24 Oct. 511/2 A battery of about 45 jackhammers..drilled two lines of holes. 1972 Southerly 32 102 He works a ship and has about the delicacy of a jackhammer. 2014 N.Y. Times 18 Dec. (Late ed.) a31/4 Inside a pneumatic, or air-powered, jackhammer, a piston hits a striker plate as many as 1,800 times a minute. < as lemmas |
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