Rescuers used props to stop the roof of the tunnel collapsing.

救援人员用支柱防止隧道顶塌陷。

《牛津词典》

In the pale light of the tunnel, 30-foot fossil traces of lycopsid gleam slickly in the shale roof like alligator skins.

在隧道内黯淡的灯光下，页岩顶部30英尺长的石松化石遗迹就像鳄鱼皮般发出柔滑的光亮。

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The design features concrete canopy structures on both sides of the tunnel - creating a large enough surface area to realise sports fields on the roof of the tunnel section.

设计的特点是隧道两侧的混凝土雨棚结构——创建足够大的表面积来实现隧道部分的屋顶上的运动场。

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"The mountains and the roof of the tunnel and everything shook, " Villaroel says.

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The Rig 421 oil drill, so-called Plan C, is currently at 265 meters and en route to the roof of the tunnel at Level 150 (150 meters above sea level).

CNN: STORY HIGHLIGHTS

Sections of a drill which broke through the roof of a rail tunnel came from a construction site above the ground, accident investigators have found.

BBC: Construction drill came from site above rail tunnel