老牛伏枥志在水利老黄牛有这么一个“牛群”，在北京的大地上，默默无闻地耕耘了将近半个世纪。他们的足迹遍布北京的山山水水，河流沟叉，他们的心血和汗水在这块大地上培育了满山遍野的鲜艳花朵──水利工程。他们热爱这块宝地──北京，更爱北京的山山水水。在近半个世... Old cattle Volatile Chi cattle in water conservancy have such a “herd” in Beijing on the earth, unknown cultivation for nearly half a century. Their footprints all over the mountains and rivers in Beijing, river furrows, their hard work and sweat in this land has cultivated brightly colored flowers everywhere - water conservancy project. They love this treasure land ─ ─ Beijing, more love Beijing’s mountains and rivers. In nearly half a century ...