| 单词 | drill steel |
| 例句 | Halfway back a heavy spur lay in the trail; some one recognized it as Stanley Mitchell's—a smith-wrought spur, painfully fashioned from a single piece of drill steel. Copper Streak Trail I have found, however, that fine cast drill steel, untempered, of the kind employed by watchmakers, is most suitable; these are generally sold in straight lengths of 30 centimeters. Scientific American Supplement, No. 392, July 7, 1883 |
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