First of all, most people buying masks are not getting one that stops the virus from reaching their mouth or nose anyway. The coronavirus is transmitted through droplets, not through the air. That means you cannot randomly breathe it in, but it also means the standard surgical mask you see people wearing will not help. Those masks are designed to keep droplets in—not to keep them out—and are intended to keep the wearer from getting others sick.

首先，大多数购买口罩的人并没有得到阻止病毒进入他们嘴巴或鼻子的口罩。冠状病毒是通过飞沫而不是空气传播的。这意味着你不能随意地吸入它，但也意味着你看到人们戴的标准外科口罩不会有帮助。这些口罩的设计目的是防止飞沫进入，而不是防止飞沫流出，而且是为了防止佩戴者传染他人