https://blog.wongcw.com/2018/10/24/%e8%ae%a2%e5%8d%95%e5%bb%b6%e8%bf%9f%e5%8f%91%e8%b4%a7%ef%bc%9amacbook-air%e6%9b%bf%e4%bb%a3%e5%93%81%e5%b0%86%e8%87%b3%ef%bc%9f/