@ToshiAkima I'd be curious about a surgical mask with a tight cloth mask over it. Some have claimed this is quite good. Even if it doesn't pass would be interesting to see how badly it fails (noting your comments on VFlex).
@ToshiAkima我很想买一个带紧布口罩的外科口罩。一些人声称这相当好。即使它没有通过，看看它的失败有多严重也会很有趣（注意您对VFlex的评论）。