@MarkAselstine @DrEricDing @DrLeanaWen @mehdirhasan Not necessarily, of course, but even if so, one has to be very optimistic to conclude that a mask alone is going to be effective over an extended period of time, including maskless in-school lunches. Not even realistic, frankly.
@当然，MarkAselstine@drericing@DrLeanaWen@mehdirhasan不一定，但即便如此，我们也必须非常乐观地得出结论，即在很长一段时间内，包括在学校午餐中，仅戴口罩是有效的。坦白说，甚至都不现实。