@jvmlost @mrpunan @FinchTH @Rose_Marie_Holt @RidleyDM @coolpix_jpg @cre8iverenewal @ToshiAkima Yes it was a generalization about outdoors. Indoors even with clean air under the same conditions (prolonged close contact) you would need masks to be protected as well, but not routine.
@jvmlost@mrpunan@FinchTH@Rose\u Marie\u Holt@RidleyDM@coolpix\u jpg@cre8iverenewal@ToshiAkima是的，这是对户外的概括。在室内，即使在同样的条件下（长时间的密切接触）有清洁的空气，你也需要保护口罩，但不是常规的。