American football is derived from the English game of rugby, and is entirely different from ordinary football, that is, soccer or association football.

美国的橄榄球运动起源于英国的橄榄球赛，同一般的足球运动、即英式足球截然不同。

youdao

Though there is an association called the Ivy League, it refers to the above schools' participation in an American football athletic conference rather than to any academic alliance.

虽然有一个叫做“常春藤联盟”的组织，但那指的是上列名校所参加的一项美式足球会，而非任何学术上的结盟。

youdao

He draw a parallel between American football and association football.

他把英式足球和美式足球做了一个比较。

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These guidelines have been endorsed by the following organizations: the NFL players association, (NFLPA) National Association of Athletic Trainers, (NATA) the American Football Coaches Association, the Neurocritical Care Society, the Child Neurology Society, the National Association of Emergency Medical Service Physicians, the National Association of School Psychologists, as well as the Child Neurology Society.

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The guidelines are endorsed by the American Football Coaches Association, the National Association of Emergency Medical Service Physicians and the National Football League Players Association.

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The accusations were presented by Chuck Blazer, American citizen and head of the Confederation Of North, Central American And Caribbean Association Football (CONCACAF).

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