ke bang造句

• The karst formation of phong nha - ke bang national park has evolved since the palaeozoic ( some 400 million years ago ) and so is the oldest major karst area in asia
  丰芽格邦国家公园的喀斯特地貌的形成是从古生代（大约40亿年前）开始的，是亚洲最古老的喀斯特地貌。