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窗户很少打开通风换气。
Windows were rarely opened for fresh air.
youdao
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交通换气力对隧道通风的影响是不容忽视的。
The influence of the traffic air exchange force on ventilation in tunnels is not negligible.
youdao
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交通换气力对隧道通风的影响是不容忽视的。
The influence of the traffic air exchange force on ventilation in tunnels is not negligible.
youdao