Later, I found a comment on Yahoo ( http://answers.yahoo.com/question/index?qid=20110925180842AA48a47 ), the explanation was really good, and the translation was dropped below as a film review :
Patrick Murphy:
In Moneyball, why In the end, the little girl is going to sing "You are really a loser"?
? (Respondent not signed):
I think it may actually be that Pete was conquered by that big contract just like ordinary people would do, and he was going to Boston to accept that contract. He told his daughter, and then her daughter gave him the CD. So he started broadcasting in the car... When he finished singing, he was deeply moved, so he finally decided to stay in Oakland and stay with his daughter.
Schuyler:
Yes, I also think that the last sentence his daughter sang was too weird if it was a joke. In fact, his daughter knew him better than anyone around her father. Pete was very successful. After he left high school, he went straight to the major leagues (although he did not become the best, but this is still great), then he served as a scout and then became the general manager of Oakland. This may not be enough to prove his success, but he then brought this almost poorest team to the American League conference finals, completely changed the course of baseball, but Pete still did not feel happy. So she sang "You are a real loser" and laughed at her father because she knew that this was who Pete thought she was, and it was not fair. Pete is a victor, a very remarkable victor, but he himself has not been able to realize this. Like the overweight batsman stumbled to first base, he was completely unaware that he hit a home run. This is why she finally sang "just enjoy the show" on the CD. She is telling her father not to be so harsh with herself, he should be happy for what he has done...
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