推荐回答（4个）
The National Football League (NFL) is the largest professional American football league, consisting of thirty-two teams from American cities and regions. The league's teams are divided into two conferences: the American Football Conference (AFC) and the National Football Conference (NFC). Each conference is then further divided into four divisions consisting of four teams each, labeled East, West, North, and South. During the league's regular season, each team plays sixteen games over a seventeen-week period, generally from September to December. At the end of each regular season, six teams from each conference play in the NFL playoffs, a twelve-team single-elimination tournament that culminates with the NFL championship, the Super Bowl. This game is held at a pre-selected site which is usually a city that hosts an NFL team. One week later, selected all-star players from both the AFC and NFC meet in the Pro Bowl, currently held in Honolulu, Hawaii. The NFL was formed in 1920 as the American Professional Football Association (it adopted the name National Football League in 1922). The NFL is one of the major professional sports leagues of North America, the others being MLB, NBA, and NHL.
1. National Film Library 国家电影图书馆
2. National Football League (美国)全国橄榄球联盟
3. National Forensic League 全国法庭辩论联盟
4. National Foresters League 全国林业工作学者联盟
不知是哪一个
http://www.nfl.com/
上官网你可以自己去了解一下。
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