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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 dodecahedron gave the tunnel enough of a circular shape in section.
使得隧道有足够的圆形截面。
youdao
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The dodecahedron gave the tunnel enough of a circular shape in section.
使得隧道有足够的圆形截面。
youdao