| 单词 | drag-line |
| 释义 | > as lemmasdrag-line drag-line n. (a) Geology each of a series of fainter glacial striations forming a fringe on the lee-side of an older set and produced when one glacier crosses the path of another; (b) an excavator having a bucket which is pulled towards the machine by a wire rope; also, the wire rope itself; also attributive. ΚΠ 1888 T. C. Chamberlin in 7th Ann. Rep. U.S. Geol. Surv. 1885–6 201 It clearly shows the older set by the drag-lines on their lee sides. 1919 C. G. Raht Romance Davis Mts. 328 The intake canal was dug with..drag lines. 1922 Glasgow Herald 28 Sept. 7 Drag-line excavators. 1940 Chambers's Techn. Dict. 263/2 Drag-line excavator, a mechanical excavating appliance consisting of a steel scoop bucket which is suspended from a movable jib; after biting into the material to be excavated, it is dragged towards the machine by means of a wire rope. 1950 Engineering 17 Nov. 369/1 A drag shovel, a drag line, a grab crane. 1956 Planning 22 56 The largest type of draglines, which cost nearly £750,000, may remove ore at the rate of up to a million tons a year, depending on the depth. < as lemmas |
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