世界上有若干球类,有着一脉相承的连带关系,不过在不同的地方,经过不同的发展过程,形式就变得很厉害。但美式足球与橄榄球,至今依然保留着若干相似之处。最显著的当然是所用的球,外形有八成以上仍很相似,都是椭圆形。再者二者的球门也大同小异,都是H状,用脚踢球穿过H的中央横梁之上,才算得分。计分方式也有相同之处:球员带球冲过对方底线,立得几分,如能再踢中H状门的上端中央,则再加分。上述种种,美式足球与橄榄球没有什么大的区别。然而因此而得出二者是一而二、二而一的结论,那就大错而特错了。最大的区别在于用手掷球的时候,美式足球可以向前掷而又可以向后传递。橄榄球则只允许向后掷而不能向前掷。在美式足球中,射门除外,用脚向前踢球就表示已准备放弃持球权,但 There are a number of ball games in the world that have the same, but in different places, through different development process, the form becomes very powerful. But American football and rugby still retain some similarities. The most significant of course is the ball used, the shape is still very similar to Bacheng, are oval. Moreover, both the goal is similar, are H-shaped, with the ball across the H’s central beam above, to be counted. There are also points scoring mode: the players crossed the bottom line across the ball, stand a bit, if you can play in the upper center of the H-shaped door, then plus points. All of the above, American football and football no big difference. However, the conclusion that the two are one, two, two and one is therefore a gross mistake. The big difference is that when throwing a ball by hand, American football can be thrown forward and can be passed backwards. Rugby football is only allowed to roll back and can not forward. In American football, except for shooting, playing forward with your feet is ready to give up the right to hold the ball, but