matt gave us a class this afternoon, at the first part of the class, we saw a film. it was mainly about american football. after the film, we began t get to know the american football. it is similar to soccer, but it was much rougher. players might get more easily. in another word, it was a game full of danger, they played just like fighting. one of the players just broke his leg during the match, and he would never play american football, because of his leg. what a pity。 matt told us that when he was in high school, he also take part in american football. he had broken his fingers for three times and his leg for once. then i was puzzled, it was a very dangerous game, why was is popular?