巴菲特致股东的信原文精读Day796：

原文：We have attempted to ease this problem by clustering our businesses into four logical groups. These are: insurance (chiefly GEICO, Gen Re and National Indemnity); regulated and capital intensive businesses (Berkshire Hathaway Energy and BNSF Railway); manufacturing, service and retailing operations（which cover the waterfront）；and finance and financial products (especially XT