https://genesis-aka.net/language/chinese/2022/04/29/60-40%e8%82%a1%e7%a5%a8%e5%80%ba%e5%88%b8%e6%8a%95%e8%b5%84%e6%af%94%e4%be%8b%e7%9a%84%e6%96%b0%e6%96%b9%e6%b3%95/
60/40股票债券投资比例的新方法