合着我反驳的你一条都没法反驳回来然后就顾左右言它?
真的,打你这种没有学术水平的人脸真没意思。来,看看以前论文怎么说
To determine factors that predispose or protect healthcare workers from severe acute respiratory syndrome (SARS), we conducted a retrospective cohort study among 43 nurses who worked in two Toronto critical care units with SARS patients. Eight of 32 nurses ...
www.ncbi.nlm.nih.gov
Mask use is associated with low adherence, but adherent mask users are significantly protected against seasonal disease.Many countries are stockpiling face masks for use as a nonpharmaceutical intervention to control virus transmission during an influenza ...
www.ncbi.nlm.nih.gov
可以自己查查nih是什么机构。不学无术不是错,出来丢人现眼就有问题了。
再者,就算有不为人知的事,那也是政客出来说的。你为了饭碗让几千人丧命说你两句还委屈了?