@RobChan66733000 @EricTopol @CDCMMWR Not much there on ventilation though, apart from masks and outdoor instruction. That outdoor instruction seemed significant suggests indoor ventilation not very good.
@RobChan66733000@EricTopol@CDCMMWR除了面罩和户外指导外，通风方面没有太多。室外指导似乎很重要，这表明室内通风不是很好。