这名英国年轻人注意到，接近地面的空气污染水平比该机构所记录的高空空气污染水平高出约三分之二。
The English youngster noticed that pollution levels are around two-thirds higher close to the ground than they are in the air at the height where they are recorded by the agency.
他们正在检测高空空气以收集原子爆炸的证据。
They were monitoring the upper air to collect evidence of atomic explosions.
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