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Each year, a small town in Wales holds the Man Versus Horse Marathon. It's a 22-mile race between riders on horseback and runners. And, while horses often win, humans will sometimes prevail. 威尔士的一个小镇每年都会举办“人马长跑大赛”，由骑马者和跑步者共同参与，赛程约为35公里。虽然骑马者常常胜出，但人类有时也能获胜。 So what makes humans such endurance running superstars? 那么，人类为什么能成为长跑健将呢？ | 
