在美国三大体育联盟里，职业橄榄球联盟享受到了体育产业和平相处的时间最久。
Professional football has enjoyed the longest period of industrial peace among America’s three main sports leagues.
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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