Hi , I'm Benjamin . Nice to meet you here . You look great .   Thank you . Nice to meet you too . I'm John . Is this your first time to take a long-distance trip on plane ?   No , this is the second time . But I also feel bad because of the lower pressure and the jet lag .   Oh , I am sorry to hear that . Take it easy . It will be OK soon . You see , I take this long-hour plane frequently , but the jet lag still makes me uneasy .   Oh , that's too bad . Do you get a good knowledge of China ?   Yes , whenever I think about China , I'd see the Tian'an Men Square . China is a very beautiful country . And I've seen many landmarks in China but I like the Great Wall most .   All of the Chinese are proud of the Great Wall . And it was built before the In dynasty near Shan Haiguan-the First Pass in the World .   Was it built before the In dynasty ? I thought it was in the Ming dynasty .   No , before the In dynasty .   Oh , yeah . Thought I am an American , I know quite a lot about China and I like Chinese tea very well .   Both the green tea and the black tea are good for our health . And I usually refresh myself with a cup of tea .   Yeah , many of my friends like Chinese tea and whenever I go back to China , I'll take some Dragon-well green tea for them .   Do you like the Chinese traditional silk ?   I heard about it , but I don't have any clothes made from silk . 