美式足球或美式橄榄球源自英式橄榄球，是橄榄球运动的一种。

American football or American football derived from the British rugby, rugby is a sport.

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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。

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

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If you think of two towns down here, Brive,b-r-i-v-e,famous for its rugby, and Tulle,t-u-l-l-e,which is a capital.

如果你可以想起来这儿的两个城镇,布瑞福,b-r-i-v-e,以英式橄榄球运动而负有盛名,图勒,t-u-l-l-e,是一个省的首府

耶鲁公开课 - 1871年后的法国课程节选