@jultar2001 @StillMadGreek @twobluecats @DrEricDing @CDCgov You don't need to close down anything to put one or two air cleaners in a room, and it's not costly either. You're just wrong about this.
@jultar2001 @StillMadGreek @twobluecats @DrEricDing @CDCgov 你不需要关闭任何东西就可以在一个房间里放一两个空气净化器，而且成本也不高。你错了。