Adds a filtration mask fore-mail attachments.

为邮件附件添加过滤关键字。

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The mask is washable many times with no loss of filtration effectiveness.

这款口罩可以多次清洗，且不会损失过滤效果。

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Objective To evaluate the filtration efficiency of different types of mask filtration materials against non-biological particles aerosol and microbial aerosol.

目的评价不同类型口罩滤材对非生物颗粒气溶胶和微生物气溶胶过滤效率。

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Filligent makes another product designed along intelligent-filtration principles, its BioMask anti-infection face mask.

FORBES: Designing A Safer Cigarette

To cope with air pollution in China, artist Matt Hope produced a "Breathing Bike, " that consists of a fighter pilot's breathing mask attached to a pedal-powered air filtration system.

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