通风道，换气坑空气流通的通道，如使矿井。
A passageway or shaft in which air circulates, as in ventilating a mine.
研究试验结果表明，分层扫气可减少换气过程的燃料损失，使燃油消耗率大幅度下降； 使混合气空燃比的范围加大。
The result shows that stratified scavenging reduces fuel loss during air exchange greatly lowing the fuel consumption rate and enlarging the air-fuel ratio range.
为防止潮湿和有害气体的增加，在塑料棚上方前檐下设换气窗，使舍内形成通过换气量可以控制温热状态的小气候。
In order to prevent the increase of damp and harmful gases, a window was designed under the front eaves of the plastic shed, so that the microclimate of the room can be controlled.
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