As more and more long tunnels are constructed, tunnel safety becomes increasingly serious.

随着长隧道较广泛的采用，隧道安全问题日益突出。

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More and more problems of karst influence railway tunnel safety, the irregular character of karst brings difficulties to survey.

越来越多的岩溶问题影响铁路隧道安全，岩溶发育的不规律性给探测、预报带来了困难。

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As an important factor for tunnel safety considerations, the tunnel ventilation has also become an important aspect of studies by scholars.

作为隧道安全考虑的一个重要因素，隧道通风问题也成为各国学者研究的一个重要方面。

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He is due to return to London, with a welcome at the House of Lords, Wednesday afternoon, after taking the ferry from Calais to Dover because his request to walk through the Channel Tunnel was refused on safety grounds.

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"If a company has its trains safety certified for the tunnel, then they could effectively start straight away, " says a Eurotunnel spokesman.

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About 40 workers were undergoing safety training at the time of the tunnel's collapse, said Freeport's Indonesia subsidiary.

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