Singhealth 推广的邮件里, 第一条就是戴口罩,听谁的
https://www.healthxchange.sg/men/health-scares-outbreaks/how-to-keep-safe-wuhan-virus-self-care-tips?utm_source=memberwuhanvirus-jan20&utm_medium=email&utm_campaign=hxcmemberwuhanvirus-jan20
1. What you should know about face masks
Face masks provide a physical barrier to prevent contaminants and pathogens from entering your nose and mouth. Conversely, they protect others from your own nose and mouth secretions. The two common types of face masks are:
1. What you should know about face masks
Face masks provide a physical barrier to prevent contaminants and pathogens from entering your nose and mouth. Conversely, they protect others from your own nose and mouth secretions. The two common types of face masks are: