https://blog.wongcw.com/2018/11/28/%e5%bf%ab%e9%80%9f%e6%95%99%e7%a8%8b%ef%bc%9a%e8%ae%93%e4%bd%a0%e5%9c%a8ios%e8%a8%ad%e5%82%99%e4%b8%8a%e4%bd%bf%e7%94%a8google-assistant/