https://qooah.com/2012/07/18/%e5%be%b7%e5%9c%8b%e6%b3%95%e5%ae%98%e5%ae%a3%e5%88%a4-xoom-%e6%b2%92%e6%9c%89%e6%8a%84%e8%a5%b2-ipad/