https://blog.wongcw.com/2018/12/19/%e4%be%9b%e6%87%89%e9%8f%88%e6%b6%88%e6%81%af%e7%a8%b12019%e5%b9%b4type-c%e8%8a%af%e7%89%87%e5%83%b9%e6%a0%bc%e8%b7%8c%e5%b9%85%e5%b0%87%e8%b6%85%e9%81%8e20/