並前往https://www.funddiscover.com/2019/03/01/%E4%BD%A0%E7%9F%A5%E9%81%93%E5%97%8E%EF%BC%9F%E5%82%B5%E5%88%B8%E7%9A%84duration-%E5%B0%B1%E5%83%8F%E7%BF%B9%E7%BF%B9%E6%9D%BF/