https://blog.wongcw.com/2021/06/18/%e5%8c%97%e4%ba%ac%e5%90%8c%e6%99%82%e5%87%ba%e7%8f%be%e7%b5%a2%e9%ba%97%e7%9a%84%e5%bd%a9%e8%99%b9%e9%9b%b2%e3%80%81%e7%92%b0%e5%9c%b0%e5%b9%b3%e5%bc%a7/
北京同時出現絢麗的彩虹雲、環地平弧