看来face shield还是不能替代face mask, 最好是一起用 a face shield could block 96% of larger cough droplets when they were laden with influenza virus. But with smaller cough aerosols less than 3.4 micrometres in size, the face shield blocked just 68%. The US Centers for Disease Control and Prevention appears to agree with him － it does not recommend face shields for normal everyday activities or as a substitute for masks. The Swiss health authorities have also warned against using face visors instead of masks after an investigation into an outbreak of Covid-19 at a hotel in the canton of Graubünden revealed all those who were infected had been wearing plastic face shields, while those who avoided infection were in masks. https://www.bbc.com/future/article/20200806-are-face-shields-effective-against-covid-19
中文的口罩应该是遮口的, 以後要买鼻罩？但是, 人家也没错, face mask遮住口就可以了
不过说真的, 口罩戴久了真不好受, 尤其是在走路运动时. 如果用Face Shield代替, 防止Covid-19的能力会差多少？
欧美人就带不惯口罩，现在拿来政治化，。。。，应该自己先照镜子 ！
我还真照了一下镜子, 理了一下头发. 镜子里是一张普通华人脸, 比欧美人差在哪啦？我又哪里政治化了？
啥理解力，你不是欧美人，就没有说你！
好吧, 不是说我就好, 谢谢回覆
a face shield could block 96% of larger cough droplets when they were laden with influenza virus. But with smaller cough aerosols less than 3.4 micrometres in size, the face shield blocked just 68%.
The US Centers for Disease Control and Prevention appears to agree with him － it does not recommend face shields for normal everyday activities or as a substitute for masks. The Swiss health authorities have also warned against using face visors instead of masks after an investigation into an outbreak of Covid-19 at a hotel in the canton of Graubünden revealed all those who were infected had been wearing plastic face shields, while those who avoided infection were in masks.
https://www.bbc.com/future/article/20200806-are-face-shields-effective-against-covid-19
faceshield戴起来在室外走路更麻烦，有风就不行。戴这玩意儿着电脑也挺别扭。
二选一我宁可选口罩。
哪个效果好？
2