https://blog.wongcw.com/2022/09/20/%e6%97%a5%e6%9c%ac%e9%80%80%e4%bc%91%e5%b7%a5%e7%a8%8b%e5%b8%ab%e9%96%8b%e7%99%bc%e5%87%ba%e7%8d%a8%e7%89%b9%e7%9a%84%e4%ba%8c%e5%90%88%e4%b8%80%e8%a8%88%e7%ae%97%e5%99%a8%e6%87%89%e7%94%a8%e7%a8%8b/
日本退休工程師開發出獨特的二合一計算器應用程序: “Twin-Calc”