另一个原因是他乘坐的客机上设有高效微粒空气过滤器。
Another reason is that the planes he flew in were equipped with HEPA filters.
第一台高效微粒空气过滤器可以消除空气中的放射性粒子。
The first HEPA filters removed radioactive particles from the air.
考虑买一部高效微粒空气过滤器，最大程度地消除过敏源的存在。
Consider purchasing a HEPA filter to remove the greatest amount of allergens.
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