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).

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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.

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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.

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