这条铁路与自然垄断有关︰其他到达马丘比丘遗址的唯一方式，就是沿着印加小径徒步旅行四天。
The railway involves a natural monopoly: the only other way of getting to the ruins is a four-day hike along the Inca Trail.
检控官及辩方律师在网站上搜寻陪审团候选人的个人信息，以便发现蛛丝马迹，说明这些人在审判中可能同情哪一方。
Prosecution and defense lawyers are scouring the site for personal details about members of the jury pool that could signal which side they might sympathize with during a trial.
另一方面欧洲殖民者引入的马之类的动物，美洲土著人也受益很多。
On the other hand Native Americans did benefit from invasive animals like the horse that was introduced from European explorers.
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