“hard-rock tunnel boring”的概念、定义、翻译、参考文献-科学参考

单词	hard-rock tunnel boring
释义	hard-rock tunnel boring [`härd ¦räk `tǝn·ǝl ´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	shortwave broadcasting shortwave converter short waveguide isolator shortwave propagation shortwave radiation short word shoshonite shot shot bit shot blasting shot boring shot break shot capacity shot copper shotcreting shot depth shot drill shot effect shot elevation shot feed shot-firing cable shot-firing circuit shot-firing curtain shot group shotgun

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