@Rose_Marie_Holt @RidleyDM @mrpunan @FinchTH @jvmlost @coolpix_jpg @cre8iverenewal @ToshiAkima The thread was mostly about filtration/clean air. If the air is clean enough, you practically don't need a mask (w/exceptions), as with outdoors
@Rose\u Marie\u Holt@RidleyDM@mrpunan@FinchTH@jvmlost@coolpix\u jpg@cre8iverenewal@ToshiAkima这篇文章主要是关于过滤/清洁空气。如果空气足够干净，你实际上就不需要像在户外那样戴口罩（有例外）