Do not place the product in a separate enclosure unless proper ventilation are provided.
除非通风良好, 不要把产品放在独立的封闭装置中。
They increased ventilation by opening the top center part of the carriage window.
他们把车厢上面的中央部分打开以增进空气的流通。
The ventilation isn't working.
通风设备出故障了。