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Pressure tunnel used more round section.
有压隧洞多采用圆形断面。
youdao
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Do research on tunnel passing through bad geological section.
隧道穿越不良地质段施工技术的研究。
youdao
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The initial section of tunnel had to be dug by hand.
隧道的起始部份不得不人工挖掘。
youdao
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The initial section of tunnel had to be dug by hand.
隧道的起始部份不得不人工挖掘。
youdao