B: Wonderful! Where shall we go today?
A: I will take you to the Great Wall.
B: Exactly my thought. l've been waiting for it so long.
A: The Great Wall like the Pyramids of Egypt, the Taj Mahal in India and the Hanging Garden of Babylon.is one of the eight great wonders of the world.
B: Yes,indeed. I have also heard an interesting saying. " You are not a true man until you've been to the wall!"
A: Yes! It is said that if we look down from the sky.the Great Wall is the only piece of architecture we can see on Earth,
B: It's so great! What's the length of the Great Wall?
A: The Great Wall starts from Shanghai Pass in the east and ends at Jiayu Pass in the west. with the total length of about 6000 kilometers or 12 000 11. That's why we call it in Chinese. Wan Li Chang Cheng' .which literally means a 'Ten-Thousand-Li-Iong Wall'.We're approaching Badaling section and you will see the Great Wall in a short time.
B: ( After a while. ) How magnificent! Would you please tell me something about the history of the Great Wall?
A: OK. Historical records trace the construction of the origin of the Wall to defensive fortification back to the year 656 BC. Its construction continued throughout the Warring States period in the fifth century BC. Later in 221 BC. when Qin unified China. for guarding against invasion by nomadic tribes from the north Emperor Qinshihuang ordered the connection and repair of these indMdual walls and further extensions to form the basis of the present great wall. Building was not finished until Ming Dynasty.
A:好的。据历史记载，将长城作为防御工事建筑的起源要追溯到公元前656年.公元前五世纪战国时期，长城得以 继续修筑 到公元前221年，秦统一中国，为了抵御来自北方的游牧民族侵略，秦始皇下令将各国分散的城墙接起来加以修缮，形成了今天万里长城的雏形。长城的修建止于明朝。
B: It is said that the. Great Wall is divided into two sections,the east and the west. What's the difference between the two sections?
A: The western part is a rammed earth construction.In the eastern part.the core of the wall is rammed earth as well,but the outer shell is reinforced with bricks and rocks.
B: How many passes are there along the Great Wall?
A: There are 14 major passes at places of strategic importance along the Great Wall,and the most important are Shanhai Pass and Jiayu Pass.
B: What are the functions of the rectangular lookout stations built about every 100m.and beacon towers at regular intervals?
A: They served as a signal system to communicate military information to the dynastic capitaI.At the approach of enemy troops, smoke signals gave the alarm from the beacon towels in the daytime and bonfire did this at night. Emergency signals could be relayed to the capital from distant places within a few hours long before the invention of anything like modern communications,
B: Thank you for your introduction.
A. You are welcome!