https://qooah.com/2014/10/17/%e5%b0%8f%e7%b1%b3%e7%9b%92%e5%ad%90%e6%8e%a8%e5%87%ba%e9%99%8d%e7%b4%9a%e7%89%88-1gb-%e5%a2%9e%e5%bc%b7%e7%89%88%e8%b3%a3-299/