https://blog.wongcw.com/2018/11/28/%e7%b3%be%e7%b5%902018%e6%ac%bemacbook-air%e5%92%8c12%e5%90%8bmacbook%ef%bc%9f%e9%80%99%e6%ae%b5%e8%a6%96%e9%a0%bb%e5%91%8a%e8%a8%b4%e4%bd%a0%e5%a6%82%e4%bd%95%e9%81%b8/