@grankfimes @Magic14272090 @myrabatchelder @kprather88 Reliable personal protection in a dangerous environment is not the same question as more people overall wearing masks -> less virus in the air and being inhaled.
Different question different answer. But none of this means that only certain masks "work".
@granktimes@Magic14272090@myrabatchelder@kprather88在危险环境中可靠的个人防护与更多人戴口罩的问题不同->;空气中的病毒和被吸入的病毒更少。
不同的问题不同的答案。但这并不意味着只有某些面具“起作用”。