https://blog.wongcw.com/2021/09/28/%e7%be%8ecdc%e7%a0%94%e7%a9%b6%e8%ad%89%e5%af%a6%ef%bc%9a%e5%9c%a8%e5%ad%b8%e6%a0%a1%e6%88%b4%e5%8f%a3%e7%bd%a9%e5%8f%af%e4%bb%a5%e6%b8%9b%e5%b0%91%e5%ad%b8%e7%94%9f%e9%96%93covid-19%e7%9a%84%e5%82%b3/
美CDC研究證實:在學校戴口罩可以減少學生間COVID-19的傳播