@Reasonableques3 @j_g_allen @olgakhazan Probably not true ("any old" mask, which to be fair includes some people w/good ones, seems to reduce spread by about 25% when widely used), but in any case kind of irrelevant to the discussion here, which is about wearing N95s.
@合理的问题3@j_g_allen@olgakhazan可能不是真的（“任何旧的”面具，公平地说，包括一些人和好的人，在广泛使用时似乎可以减少传播25%左右），但无论如何与这里的讨论无关，这是关于佩戴N95的。