ventilation
n[U]
1 ventilating or being ventilated 空气流通
increase ventilation by opening the top centre part of the carriage window 把车厢窗户上面的中央部分打开以增进空气的流通
[attrib 作定语]
the ventilation shaft of a coal-mine 煤矿的通风竖井.
2 system or method by which a room, building, etc is ventilated 通风设备; 通风方法
The ventilation isn´t working. 这个通风设备出故障了.