https://blog.wongcw.com/2020/08/04/%e5%b0%8f%e9%b5%ac%e6%b1%bd%e8%bb%8a%e7%b4%90%e7%b4%84ipo%e5%89%8d%e5%86%8d%e7%8d%b2%e9%98%bf%e9%87%8c%e5%b7%b4%e5%b7%b4%e6%8a%95%e8%b3%87/