https://blog.wongcw.com/2018/11/06/%e8%98%8b%e6%9e%9c%e4%bb%a4%e4%ba%ba%e8%bf%b7%e6%83%91%e7%9a%84mac%e7%94%a2%e5%93%81%e7%b7%9a%ef%bc%9amacbook-air-vs-macbook/