华府邮报上载哈佛流行病专家文章：全球将有40-70%人口被传染，但不一定都发病

https://www.google.com/amp/s/www.washingtonpost.com/health/coronavirus-outbreak-edges-closer-to-pandemic/2020/02/21/03afafc0-5429-11ea-9e47-59804be1dcfb_story.html%3foutputType=amp