根据监控数据显示，今年伦敦市空气粉尘浓度第36次达到危险临界值，成为了欧洲污染最严重的城市之一。
The City of London has been found to be one of the most polluted places in Europe after monitoring equipment recorded dangerous levels of minute particles for the 36th time this year.
第5章空气、水分与天气变化。
正常情况下，客舱空气来自于发动机低能量的第5级，9级空气自动分配以满足用户系统的需要。
The normal cabin air source is obtained from the 5th-stage of the engines at low –engine power, 9th-stage air automatically substitutes to meet user system needs.
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