@RidleyDM @DrLeanaWen I think from a policy perspective we just have to grant that mainstream consensus and CDC presented "evidence" is that masks do work to an extent for the purpose indicated. I wouldn't suggest that for praying, but then, some would disagree...
@RidleyDM@DrLeanaWen我认为，从政策角度来看，我们必须承认主流共识，CDC提供的“证据”是，口罩确实在一定程度上起到了指定的作用。我不建议你祈祷，但有些人会不同意。。。