"极限自行车"是个多义词，它可以指极限自行车（电影名）,极限自行车（体育类小游戏）,极限自行车（iOS游戏）,极限自行车（手机游戏）。
自行车越野赛是一项极限自行车赛道竞技赛在2008成为中国北京夏季奥运会的参赛项目。
Bicycle Moto Cross (BMX), an extreme style of bicycle track racing, became a sport in the 2008 Summer Olympic Games in Beijing, China.
埃斯泰尔戈姆的大教堂 次日清晨，当我沿着河边的自行车道前行时，疼痛让我觉得那天的行程（15英里到达维谢格拉德）将是自己的极限了。
When I set off down the riverside biking path that morning, I had an aching suspicion that the day’s walk — 15 miles to Visegrad — might be my last.
这么艰苦的比赛，似乎已逼近人类的极限，无怪乎早就传闻，在环法自行车大赛中，使用违禁药物已司空见惯。
Such a hard race seems to be near the human's maximum. No wonder as the rumor went earlier, it was quite common that forbidden drugs had been used in the Tour de France.
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