In the center of each gallery is a ventilation shaft, bounded by a low railing.

在每一条廊道中心都有一口通风井，外面围着一道矮矮的栏杆。

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There was a family of cats on the rooftop there, making their home in the ventilation shaft.

在那儿的屋顶上，住着猫的一家，它们的家安在通风竖井里。

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These tunnels have been equipped with the advanced jet and axial shaft ventilation systems, and alarm and monitoring systems. And also a new light source has been employed.

隧道内采用橡胶防水板防渗漏，设置先进的射流和轴流竖井通风系统，配有报警监控系统，采用新光源照明。

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About 50 rescuers are trying to free them from a ventilation shaft at Gleision Colliery near Cilybebyll, Pontardawe.

BBC: Trapped miners: Bid to rescue men in Swansea Valley

He also plans to transform the 28m-long ventilation shaft into a subterranean climbing wall.

BBC: Reawakening the Underground