#マスクの効果:The effect of the mask

マスクは不織布が最も性能が高いが、布マスクでも効果はある。
 
人にコロナをうつさないためのエチケットとしてマスクは必要。

Non-woven fabrics have the highest performance as masks, but cloth masks are also effective.

A mask is necessary as an etiquette to prevent the transfer of corona to people.
 
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