https://blog.wongcw.com/2018/10/30/%e7%95%b6%e6%8a%8amac%e5%8d%87%e7%b4%9a%e5%88%b0mac-os-x-ei-capitan%e6%96%b0%e7%89%88%e5%be%8c%ef%bc%8c%e5%a6%82%e4%bd%95%e9%96%8b%e5%95%9f%e4%b8%89%e6%8c%87%e6%8b%96%e7%a7%bb%e5%8a%9f%e8%83%bd/