触地得分后，得分方有机会踢附加分或尝试两分转换。然而，由于停顿和暂停，比赛通常持续更长时间。
American football is a popular sport in the United States with a set of complex rules. Here is a brief introduction to the rules of American football:
1. The game is played between two teams, with each team trying to score more points than their opponent.
2. A team consists of 11 players, and the objective is to move the ball down the field and into the opponent's end zone to score a touchdown.
3. The team in possession of the ball has four attempts, known as downs, to advance at least 10 yards. If they succeed, they are given another set of four downs.
4. If the team fails to advance 10 yards within four downs, they typically choose to punt the ball to the opposing team, giving up possession.
5. The opposing team's objective is to prevent the offense from advancing and ideally, force a turnover by intercepting the ball or recovering a fumble.
6. Points can be scored in various ways:
- A touchdown is worth 6 points. After scoring a touchdown, the scoring team has the opportunity to kick an extra point or attempt a two-point conversion.
- A field goal is worth 3 points and can be attempted from anywhere on the field.
- A safety, which occurs when the defense tackles the ball carrier in their own end zone, is worth 2 points.
7. The game is divided into four quarters, each lasting 15 minutes. However, due to stoppages and timeouts, games often last much longer.
8. The team with the most points at the end of the game wins.
在美国，橄榄球是一项很受欢迎的运动，拥有复杂的规则。以下是对美式橄榄球规则的简要介绍：
1. 比赛是由两支球队进行的，每个队伍都试图得分超过对手。
2. 一队由11名球员组成，目标是将球推进到对方的终区以得分。
3. 持球方有四次尝试机会，即下，来至少推进10码。如果成功，可以获得另外四个下。
4. 如果在四个下内无法推进10码，通常选择将球踢给对方球队，放弃球权。
5. 防守方的目标是阻止进攻方的推进，并在可能的情况下通过拦截球或恢复球权实现换手。
6. 可以通过多种方式得分：
- 触地得分为6分。触地得分后，得分方有机会踢附加分或尝试两分转换。
- 三分球可以在场上任何地方尝试得分。
- 安全分发生在防守方在自己的终区内将持球者铲倒，得2分。
7. 比赛分为四节，每节持续15分钟。然而，由于停顿和暂停，比赛通常持续更长时间。
8. 比赛结束时得分更多的球队获胜。
