In the West, football was once synonymous with humility and brutality. At that time, there were no rules for football activities, let alone etiquette, and there was no difference between fighting with a group fight. It is common to kill people. But this game is particularly bloody. Particularly exciting and attractive. Although repeatedly banned, it is often "spring breeze blows up. " In order to make this game that people love and hate to benefit the body and mind, and to change the image of "cheap kicker", people Created football rules, added football etiquette. What does this passage mean? ['Rules and etiquette are important for football.', 'Football has always been popular in the West.', 'Football has a history of being spurned.', 'Football has undergone tremendous changes.']