But in tunnels, especially in long tunnels, it will be better to use leaking coaxial cable.

而在隧道区间，特别是长隧道区间，用泄漏同轴电缆辐射覆盖较优。

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It's not a dog, but a rodent that lives in underground tunnels.

它不是一直狗，而是一种住在地下隧道里的啮齿类动物。

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But upgrading roads and Bridges and building tunnels in a city of 14 million is challenging.

但是，要在这个拥有1400万人口的城市里进行道路、桥梁翻新和隧道建设确实是一个巨大的挑战。

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Drilling the escape tunnels, it appears, is but one stage in each miner's rescue and recovery.

CNN: STORY HIGHLIGHTS

The Steamboat Springs castle stands 40ft high, but is more compact than the one in Minnesota, with small courtyards and ice tunnels that illuminate at night with light.

BBC: Two castles, built icicle by icicle

The numerous grape varieties are grown elsewhere in Austria, but maturation of the sparkling wines takes place in the dark 2.3km network of stone and brick tunnels that run under the northern 19th district.

BBC: In the kitchen with Viennese history