Guide:They’re fortresses.
Tourist:I can see lots of people going up there. Can we go up too?
Guide:Certainly. Let’s walk to the fortress on that peak. So you know,Chairman Mao once said:“He who has never been to the Great Wall is not a true man.”
Tourist:You are right. Let’s climb up to the peak. It’s amazing,isn’t it?The wall was really a tremendous engineering feat. Now tell me again,when was the Wall built and how long did it take to do it?