以下为句子列表：
英文: The long wait was 15) due to a number of 16) factors, including the 17) challenges of building a railway system over permafrost and at 18) altitudes of over 4,000 meters!
中文: 如此漫长的等待归咎于一些因素，包括在冻土及海拔超过4,000公尺的高度建筑铁路的困难挑战！
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英文: The railway system is regarded as the artery of our country.
中文: 铁路系统被视为 我国的大动脉.
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英文: There is a big underground railway system in London.
中文: 伦敦有庞大的地下铁路网。
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