@JoyHenningsenMD "not sustainable to have zero Covid risk" isn't useful and is basically straw man or appeal to an unrealistic extreme when you CAN have risk varies across orders of magnitude, in a reasonably sustainable way. What to do with THAT, who knows.
@JoyHenningsenMD“没有持续的新冠病毒风险”是没有用的，基本上是一个稻草人，或者当你的风险以一种合理可持续的方式在数量级上变化时，你会求助于一个不切实际的极端。怎么办，谁知道呢。