https://blog.wongcw.com/2020/08/04/canalys%ef%bc%9a%e4%ba%8c%e5%ad%a3%e5%ba%a6%e5%b9%b3%e6%9d%bf%e5%87%ba%e8%b2%a8%e9%87%8f%e5%a2%9e%e5%8a%a026-ipad%e5%a4%a7%e8%b3%a31430%e8%90%ac%e5%8f%b0/