https://qooah.com/2012/09/21/%e5%82%b3-google-%e5%b7%b2%e9%81%9e%e4%ba%a4%e7%8d%a8%e7%ab%8b%e5%9c%b0%e5%9c%96%e6%87%89%e7%94%a8%e8%87%b3-apple-%e5%af%a9%e6%a0%b8/