https://blog.wongcw.com/2019/10/25/%e7%b6%b2%e6%98%93%e6%9c%89%e9%81%93%e4%bb%8a%e6%99%9a%e7%99%bb%e9%99%b8%e7%b4%90%e4%ba%a4%e6%89%80ipo%e5%ae%9a%e5%83%b917%e7%be%8e%e5%85%83/