https://blog.wongcw.com/2018/12/07/apple-watch-series-4-%e7%9a%84%e5%bf%83%e9%9b%bb%e5%9c%96%e5%8a%9f%e8%83%bd%e4%b8%8a%e6%89%8b%e9%ab%94%e9%a9%97/
Apple Watch Series 4 的心電圖功能上手體驗