@FinchTH @AndrewNoymer People do that with N95s too. The only reason it doesn't happen more than it does is N95 use being relatively rare, so the people doing that are taking a bit more initiative.
@FinchTH @AndrewNoymer 人们也用 N95 来做到这一点。它没有发生的唯一原因是 N95 的使用相对较少，所以这样做的人采取了更多的主动性。