Three fourths of the United States has geology suitable for underground air storage.

美国四分之三区域的地质适合于地下空气存储。

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My uncle gathered over 100 volunteers to build an underground air-raid shelter for this village.

我四叔就召集了一百多个义工为这个村庄盖了一个地下防空洞。

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The utility model relates to a mining device, in particular to a mine underground air door anti-collision device.

本实用新型涉及一种矿用装置，具体是一种矿井井下风门防撞装置。

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When he was alive, the concrete structure, buried four storeys underground, was air-conditioned.

ECONOMIST: A rebel stronghold becomes an unlikely tourist trap

The new study looked at how much metal this so-called particulate matter is contained in the air of underground train systems.

BBC: Railway tracks

The furnace drew air from an underground tunnel to beneath the grate where the fuel was placed.

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