[{'role': 'USR', 'utterance': "I don't understand why you always look so happy, so energetic. It seems like you'Ve got good news everyday."}
 {'role': 'SYS', 'utterance': 'Really? Do I look happy all the time?'}
 {'role': 'USR', 'utterance': 'All I know is you look quite differently from other teachers.'}
 {'role': 'SYS', 'utterance': "Oh, do you know why? Actually, it's easy. Because I always exercise. My exercise, I think, is very hard. I often feel very good after conquering these difficulties. I feel alive!"}
 {'role': 'USR', 'utterance': 'Oh, I know. I saw you doing pull-ups one time on the campus 5 and some students trying to imitate you.'}
 {'role': 'SYS', 'utterance': "Yeah, they are doing it for fun. Seldom would people like my exercise. It's difficult and boring."}
 {'role': 'USR', 'utterance': "It's true. Many students do the exercise when they have to. We have P. E. once a week."}]
{'role': 'SYS', 'utterance': "But I think Chinese students need to exercise more. Besides exercise will help them learn new things better. Don't students want to have a good memory?"}