@MichaelSFuhrer You can probably even modify this somewhat. If you know a place has extremely good ventilation, and reasonable distancing, that's probably okay too even without a mask, at least a big risk reduction if not entirely.
@MichaelSFuhrer您甚至可以对此进行一些修改。如果您知道一个地方通风良好且距离合理，那么即使不戴口罩也可能没问题，至少可以大大降低风险，如果不是完全的话。