https://blog.wongcw.com/2022/07/21/%e7%96%91%e4%bc%bc%e5%85%a8%e6%96%b0%e6%9c%ac%e7%94%b0%e6%80%9d%e5%9f%9ftype-r%e5%94%ae%e5%83%b9%e6%9b%9d%e5%85%89%ef%bc%9a%e8%b3%a335-45%e8%90%ac%e5%85%83/