https://blog.wongcw.com/2018/12/20/%e8%b0%b7%e6%ad%8c%e5%8f%88%e6%9c%89%e4%ba%86%e6%96%b0%e5%85%84%e5%bc%9f%e5%85%ac%e5%8f%b8%ef%bc%9a%e7%94%a8%e9%b9%bd%e5%ad%98%e5%84%b2%e9%9b%bb%e8%83%bd%e9%9c%80%e8%a6%81%e6%99%82%e5%86%8d%e9%87%8b/
谷歌又有了新兄弟公司:用鹽存儲電能需要時再釋放