https://blog.wongcw.com/2023/03/23/2022%e5%9c%96%e9%9d%88%e7%8d%8e%e6%8e%88%e4%ba%88%e4%bb%a5%e5%a4%aa%e7%b6%b2%e4%b9%8b%e7%88%b6bob-metcalfe-%e5%85%b6%e5%90%8c%e5%90%8d%e5%ae%9a%e5%be%8b%e6%88%90%e7%82%ba%e4%ba%92%e8%81%af%e7%b6%b2/