the details about the difference between American football and soccer

照字面的理解是:美式足球---橄榄球
soccer-----足球
这些都是美式说法,也就是美语

American football是那种撞来撞去的橄榄球！
soccer是用脚踢的圆形的足球！

What Americans call soccer is called football everywhere else in the world (football in British English and French, futbol in Spanish, fussball in German, etc.). There is in an international body governing this sport, so it's safe to say that American soccer and British football are exactly the same sport, even if attracts far more fans in Britain. :)
The official name of the sport is associative football. The international governing body that I mentioned above is referred to as FIFA, from the French "Federation Internationale de Football Associatif" (International Federation of Associative Football). It seems that at some point, "associative football" was abbreviated as "assoc," from which we somehow got the American version "soccer."
All this is complicated by the fact that America has its own game called "football," with helmets and touchdowns and such. This game is completely American, although the rest of the world is beginning to learn about it. To distinguish it from soccer, other countries refer to it specifically as "American football".

American football and soccer are totally two different athletic sports.
American football=rugby 橄榄球
soccor=what we usually called "football"

American football是橄榄球soccer是English football,就是传说中的足球What Americans call soccer is called football everywhere else in the world (football in British English and French, futbol in Spanish,...

American football：是美国橄榄球，这种运动好象只有美国有，就是N多人抢一个椭圆的球那中运动
soccer在美国就等同与足球在中国的意思，也就是足球的意思！