- opening up by tunnels
- 平硐开拓
English-Chinese dictionary of mining (英汉矿业大词典). 2013.
opening up by tunnels
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tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening … Universalium
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