https://blog.wongcw.com/2021/10/04/%e4%bc%b0%e5%80%bc250%e5%84%84%e7%be%8e%e5%85%83-%e6%b2%83%e7%88%be%e6%b2%83%e6%b1%bd%e8%bb%8a%e5%b0%87%e5%9c%a8%e7%91%9e%e5%85%b8ipo/