得到Dq大牛方法一二讲解，又找了些资料

感兴趣同学可以读：
www.washingtonpost.com/business/economy/how-warren-buffett-and-don-graham-are-saving-675-million-in-taxes/2014/04/10/2636dd60-c0ec-11e3-bcec-b71ee10e9bc3_story.html