https://qooah.com/2012/09/05/apple-%e8%88%87-google-%e9%9b%84%e9%9c%b8%e7%be%8e%e5%9c%8b%e6%99%ba%e8%83%bd%e6%89%8b%e6%a9%9f%e5%b8%82%e5%a0%b4/