並前往https://antoniochen.com/2012/04/29/%E8%82%A1%E7%A5%A8-beta-%E7%B3%BB%E6%95%B8%E8%88%87%E8%82%A1%E7%A5%A8%E6%8A%95%E8%B3%87%E7%B5%84%E5%90%88-portfolio%E7%9A%84%E5%BC%B7%E5%8C%96/
