英语词汇“hard-rock tunnel boring”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

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.
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