一些人认为美式足球是一项粗暴的运动。

Some people feel that American football is a brutal sport.

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美式足球是美国最受观众欢迎的运动。

American football is America's most popular sport to watch.

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橄榄球，又称美式足球，在美国是一项很受欢迎的运动。

Rugby, which is also called American football, is a popular sport in America.

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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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篮球运动员18位，美式橄榄球21位，足球12位。

Basketball has 18, American football 21 and soccer 12.

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哪个美式足球运动员戴的头盔最大?。

Which football player wears the biggest helmet?

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哪个美式足球运动员戴的头盔最大?。

Which football player wears the biggest helmet?

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