西部地理——甘肃印象：寻找古老文明的活力之源：searching for the source of vitality of the ancient civilization Tracing the source of the Liaohe river civilization Introduction to the study of the history of ancient civilizations Searching for the beauty of ancient architecture 并列题名：Introduction to the study of the history of ancient civilizations History and treasures of an ancient civilization Mystery of the four great ancient civilizations Searching for the lost civilizaton-ancient Egypt Comparative study for the history of the Chinese and western ancient civilizations