As offices and homes often have inadequate ventilation, these chemicals can build up to become health nuisances.

由于办公室和住家往往通风不良，这些化学物质会愈积愈多进而成为危害健康的物质。

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Researchers have discovered the vast underground colonies where up to seven million of the insects live have their very own in-built ventilation shafts.

研究人员发现了蚂蚁在地下的居住区。里面有700万只蚂蚁住在它们自己造的通风洞穴里。

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The setup is like a termite hill providing natural ventilation just by set up with ground pipes and a solar tower.

该建筑看起来就像是一个白蚁的巢穴，通过地面管道和太阳能塔提供自然通风。

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The MTA took extensive measures before the storm to limit the amount of water flooding into tunnels, including by boarding up ventilation grates in low-lying stations, piling sandbags at station entrances, inflating a rubber dam in the Long Island Rail Road's West Side yards in Manhattan and hastily erecting a floodwall across the mouth of the No. 3 train tunnel near East 148th Street in Harlem.

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The same team assessed the entire museum (150, 000 square meters of lighting, heating, electrical and ventilation systems) and came up with a seven-year plan detailing when the equipment would have to be replaced and how much it would cost annually.

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It travels through air vents and cracks in walls, along ventilation and elevator shafts, and up stairways.

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