美国国家橄榄球联盟(nfl)是世界上非常成功的体育组织之一，也号称美国第一大职业体育联盟。
The National football league (NFL) is one of the best successful sport organizations in the world, and is known as the most popular sport league in American's professional sport league.
美国国家橄榄球联盟(nfl)是世界上非常成功的体育组织之一，也号称美国第一大职业体育联盟。
The National football league (NFL) is one of the best successful sport organizations in the world, and is known as the most popular sport league in American's professional sport league.
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