@connellryan1 @DrLeanaWen That's just not true. Open your eyes. I see ordinary people wearing KN95s or KF94s without significant gaps (certainly nothing remotely approaching 3mm) every single day.
Your premises are absurd in the real world.
@connellryan1@DrLeanaWen那不是真的。睁开你的眼睛。我看到普通人每天都穿着KN95或KF94，没有明显的空隙（当然没有接近3mm的空隙）。
你的前提在现实世界中是荒谬的。