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氡污染水平较低，接近环境本底水平值。
Its radon pollution is low, near to the environment background value.
youdao
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另外两种空气污染需要某种提示：氡和石棉。
Two other air pollutants require some mention: radon and asbestos.
youdao
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另外两种空气污染需要某种提示：氡和石棉。
Two other air pollutants require some mention: radon and asbestos.
youdao