1. 布口罩本来就不行,文中法国人讲的那是handmade cloth,你可以在加拿大大街上看见这种,确实没啥用。正好看到新闻 德国说布口罩不行
Face masks: What's the difference between a cloth one and an FFP2?
As authorities in southern Germany and in Austria make FFP2 masks mandatory on public transport and in shops, we ask an expert what difference these masks make.www.euronews.com