The railway involves a natural monopoly: the only other way of getting to the ruins is a four-day hike along the Inca Trail.

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。

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The couple flew to Port Moresby, Papua New Guinea's capital, and set off on a 60-mile hike along the Kokoda Trail, in the south-east of the country.

这对情侣便飞往巴布亚新几内亚的首都莫尔兹比港，开始沿该国东南部著名景点科科达小径60英里的徒步旅行。

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For our hike, my two companions and I (A) had chose (B) to walk along the Appalachian Trail, one of (C) theoldest and best-loved (D) hiking paths in the United States.

题目：我和我的同伴在远足旅行中选择沿着阿巴拉锲亚山脉走，踏实美国最古老也是最受喜爱的远足路途之一。

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For our hike, my two companions and I (A) had chose (B) to walk along the Appalachian Trail, one of (C) theoldest and best-loved (D) hiking paths in the United States.

题目：我和我的同伴在远足旅行中选择沿着阿巴拉锲亚山脉走，踏实美国最古老也是最受喜爱的远足路途之一。

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