@LisaForKansas @wsbgnl Take that study with a grain of salt. There was one male and one female volunteer testing the masks. They probably knew how to use respirators generally (it was done in a hospital I think) e.g. bend nose clip at least. General public without training often doesn't have a clue.
@LisaForKansas@wsbgnl对这项研究持怀疑态度。有一名男性和一名女性志愿者在测试口罩。他们可能知道一般情况下如何使用呼吸器（我想这是在医院里做的），例如至少弯曲鼻夹。未经培训的普通公众通常没有任何线索。