https://blog.wongcw.com/2022/11/02/%e7%be%8e%e5%85%89%e9%96%8b%e5%a7%8b%e4%bd%bf%e7%94%a81-beta%e7%af%80%e9%bb%9e%e8%a3%bd%e9%80%a0%e4%b8%96%e7%95%8c%e4%b8%8a%e6%9c%80%e5%85%88%e9%80%b2%e7%9a%84dram/