Among other experiments, his students use a" sneeze machine" to measure how far viruses fly out of the nose and mouth when people sneeze, cough, talk or just breathe....
High above where people circulate, the lamps emit ultraviolet light that, given some time, can kill bacteria and fungi and break apart viruses....
And they must stay up high because to kill germs, the lamps must emit so much UV light that it would be irritating to people, especially their eyes....
综合
美国有线电视-特朗普新闻
2020-04-26 00:00:00.0