Pictures and brand of all PM2.5的口罩... check them out here

來源: 於 2013-04-24 10:07:28 [舊帖] [給我悄悄話] 本文已被閱讀：次

https://www.google.com/search?q=pM2.5+mask&tbm=isch&tbo=u&source=univ&sa=X&ei=jhB4UaGwAcOa2AWasYCYDw&ved=0CHYQsAQ&biw=1304&bih=897