@caro_vina @August_West_GD @RadioFreeTom @mehdirhasan Yes masking works because it keeps the air clean.
If there is a room with three people, you being one, and ONE of the other people is wearing a mask, you are at less risk than if neither are.
@caro_vina@August_West_GD@RadioFreeTom@mehdirhasan Yes掩蔽效果很好，因为它能保持空气清洁。
如果一个房间里有三个人，而你是其中一个人，而另一个人戴着口罩，那么你的风险比两个人都不戴口罩的风险要小。