https://blog.wongcw.com/2018/12/27/%e5%b0%8f%e7%b1%b3%e7%ad%89%e5%a4%a7%e5%9e%8b%e4%ba%a4%e6%98%93%e5%8a%a9%e5%85%a8%e7%90%83ipo%e6%94%b6%e5%85%a5%e8%b6%852000%e5%84%84%e7%be%8e%e5%85%83%e5%89%b54%e5%b9%b4%e6%96%b0%e9%ab%98/