@IslandPirates77 @ChrisACole @elaine_hali @J_D_Klein @HalCranmer It depends on the objective, and 'not designed or certified' is really not the right test at all. Occupational PPE and community masking are two different problem spaces.
@IslandPirates77@ChrisACole@elaine_hali@J_D_Klein@HalCranmer这取决于目标，“未经设计或认证”实际上根本不是正确的测试。职业PPE和社区掩蔽是两个不同的问题空间。