在其大部分的历史中，职业美式足球都是在一个联盟——国家美式足球联盟(nfl)中比赛。
For most of its history, professional American football was played within a single National football League (NFL).
尤其在美国——国家美式足球联盟(nfl)半数以上的球队都在使用这种草皮，至少其训练馆中会采用此技术。
More than half of the country's National Football League (NFL) teams have it, at least on their practice facilities.
尽管造过一些声势，但他从未当上过教练或是任何顶级球队的主管，或是有像美国国家美式足球联盟(NFL)前明星球员约翰•麦登(John Madden)或高尔夫球员强尼•米勒(Johnny Miller)那样的劲头，当上大电视台的体育评论员。
Despite several overtures, he has never served as coach or a top team executive, or as a major television commentator in the spirit of ex-NFL great John Madden or golf's Johnny Miller.
在职业美式足球，超级杯的冠军争夺战的国家橄榄球大联盟(nfl)。
In professional American football, the Super Bowl is the championship game of the National football League (NFL).
在职业美式足球，超级杯的冠军争夺战的国家橄榄球大联盟(nfl)。
In professional American football, the Super Bowl is the championship game of the National football League (NFL).
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