https://hmitalk.com/2021/03/ecurve%e5%8d%b3%e5%b0%87%e8%b5%b0%e5%85%a5%e6%ad%b7%e5%8f%b2%ef%bc%81mm2%e9%82%80%e4%bd%a0%e5%8f%83%e5%8a%a0ecurve%e6%9c%80%e5%be%8c%e4%b8%80%e5%a0%b4%e9%a6%96%e6%98%a0%e6%9c%83%ef%bc%81/