Měishì gǎnlǎnqiú de qiúyuán yào dài tóukuī hé hùjiān, yīnwei bǐsài zhōng de shēntǐ pèngzhuàng hěn jīliè.
American football players wear helmets and shoulder pads, because the contact in a game is very rough.
Tips
usage
On the mainland 足球 always means soccer, and 橄榄球 "olive ball" covers rugby too, so 美式橄榄球 pins down the American game; rugby is 英式橄榄球. Taiwan and Hong Kong more often say 美式足球.