Some N95 masks, and in many cases some cloth masks, have valves that make them easier to breathe by means of. But these masks don't filter the air the wearer breathes out. Because of this, they have been banned in certain locations.知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。No, AirTags have