FFU have primary and hepa two pole filter net.
ffu设有初、高效两极过滤网。
Can HEPA filters prevent heart disease in the elderly?
可以肝癌过滤器，防止心脏病的老人呢？
Another reason is that the planes he flew in were equipped with HEPA filters.
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.
另一个原因是他乘坐的客机上设有高效微粒空气过滤器。
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