https://blog.wongcw.com/2021/07/20/%e6%93%94%e6%86%82%e7%b5%84%e7%b9%94%e6%88%90%e5%93%a1%e8%a2%ab%e6%89%93%e6%93%8a%e5%a0%b1%e5%be%a9app-fairness%e5%b8%8c%e6%9c%9b%e6%b3%95%e9%99%a2%e6%92%a4%e5%9b%9e%e8%98%8b%e6%9e%9c%e7%9a%84/