radon level
氡水平
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室外的氡水平通常很低。
Outdoor radon levels are usually very low.
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可通过以下方法降低家中的氡水平
Radon levels in homes can be reduced by
鉴于在空气中的稀释，室外的氡水平通常很低。
Due to dilution in the air, outdoor radon levels are usually very low.
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