https://blog.wongcw.com/2023/04/16/%e5%be%9ealpha%e5%88%b0omicron-%e6%8f%ad%e9%96%8bcovid-19%e5%a4%a9%e7%84%b6%e5%85%8d%e7%96%ab%e5%8a%9b%e7%9a%84%e7%a7%98%e5%af%86/