https://blog.wongcw.com/2018/10/30/mac%e6%95%99%e5%ad%b8-%e8%87%aa%e8%a3%bdmac-os-x-el-capitan%e7%b3%bb%e7%b5%b1%e5%ae%89%e8%a3%9d%e7%a2%9f%ef%bc%8c%e9%87%8d%e8%a3%9d%e7%b3%bb%e7%b5%b1%e6%9b%b4%e5%bf%ab%e9%80%9f/