@jsparklin27 @JeromeAdamsMD @Kbrady04 Those are KN95 and KF94 masks, neither of which are subject to any regulatory standards in the US and are often counterfeit or otherwise fail when people test them. Also, ear loops don't result in a reliable seal, particularly when moving around.
@jsparklin27@JeromeAdamsMD@Kbrady04这两种口罩是KN95和KF94口罩，它们都不受美国任何监管标准的约束，通常是假冒的，或者在人们测试它们时以其他方式失败。此外，耳环不会产生可靠的密封效果，尤其是在移动时。