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亨利:
I had known about the Great Wall since I was a child, and I finally get to see it in person today. 
我从小就知道中国有万里长城.今天终于亲眼见到了.
凯特:
They say: "You are not a hero unless you climb on the Great Wall." You are a hero now.
俗话说:"不到长城非好汉".你今天终于也成好汉了.
亨利:
Yeah! The Great Wall is indeed great. To build walls amongst high mountains is not too easy.
是啊.长城确实了不起.在这么高的山脉中修筑起这么雄伟的城墙真不容易.
凯特:
The Great Wall was made of earth first and rebuilt with bricks during the Ming Dynasty, which is what we see now.
长城原来是用土修筑起来的.到了明代才改建了砖石结构.就是我们现在看到的这样.
亨利:
Was it used for defense purpose in the past?
早先修长城完全是为了防御吧?
凯特:
Yeah, but during the Qing Dynasty, it slowly lost its original function.
是的.可是到了清代逐渐丧失了防御作用.
亨利:
Oh, I see.
哦.我知道了.