| 单词 |
hard-rock tunnel boring |
| 释义 |
hard-rock tunnel boring hard-rock tunnel boring[′härd ¦räk ′tən·əl ‚bȯr·iŋ] (mining engineering) A tunneling method utilizing a mole to cut out 7-foot-diameter (2.1-meter) drifts in hard rock at an average rate of 5 feet (1.5 meters) per hour. |
| 随便看 |
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