5个口罩已经60$了。。 果然。。
https://www.amazon.com/Flever-Protective-Disposable-Maintenance-free-Anti-particle/dp/B07XSQNL4F/ref=sr_1_7?crid=2ELQ153U836SM&keywords=n95+1860+mask&qid=1580077751&sprefix=n95+1860%2Caps%2C-1&sr=8-7