more efficient ventilation
more efficient ventilation
更有效的通风
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Helsinki Airport, for example, has cut its carbon dioxide emissions by nearly 2, 500 tonnes compared to 2011, by making heating, ventilation and lighting more energy-efficient, as well as using electrically-operated vehicles.
BBC: Airports doing more to go green