https://blog.wongcw.com/2018/10/23/%e6%8f%ad%e7%a7%98-google-titan-m-%e8%8a%af%e7%89%87%ef%bc%9apixel-3-%e7%9a%84%e7%bb%88%e6%9e%81%e4%bf%9d%e9%95%96%e6%98%af%e5%a6%82%e4%bd%95%e7%82%bc%e6%88%90%e7%9a%84%ef%bc%9f/