求翻译：橄榄球传入美国后，人们把规则改变，包括改为可以向前传球。由于球赛中往往会与对方球员有身体冲撞，因此球员需穿护具及头盔出赛。是什么意思？

Football into the United States, people change the rules, including the forward pass can be changed. As with other game players often have a physical collision, so players need to wear protective gear and helmets to race.

rugby spread to the United States, it has to have the rules change for change, including the ball can move forward. Soccer Match will often result in collisions with other players, and therefore players needed to wear a body guards and helmets.

After the rugby spreads to US, the people the rule change, including change may pass a ball forward.Because in the sports match often meets and opposite party player has the body to dash, therefore the player must put on the equipment maintenance and the hard helmet competes.

Football incoming United States Hou, it changes the rules, including to pass the ball can move forward. Because often in the game and other players with physical collision, so players need to wear protective gear and helmets to play for.

Football incoming United States Hou, it changes the rules, including to pass the ball can move forward. Because often in the game and other players with physical collision, so players need to wear protective gear and helmets to play for.