https://blog.wongcw.com/2018/11/12/ipad-8%e6%ad%b2%e4%ba%86%ef%bc%9a%e5%ae%83%e9%82%84%e6%98%af%e5%96%ac%e5%b8%83%e6%96%af%e8%a8%ad%e6%83%b3%e7%9a%84%e7%ac%ac%e4%b8%89%e7%a8%ae%e4%b8%ad%e9%96%93%e8%a8%ad%e5%82%99%e5%97%8e%ef%bc%9f/