Pressure tunnel used more round section.
有压隧洞多采用圆形断面。
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。
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。
The dodecahedron gave the tunnel enough of a circular shape in section.
使得隧道有足够的圆形截面。
The dodecahedron gave the tunnel enough of a circular shape in section.
使得隧道有足够的圆形截面。
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