名词
中文翻译：地下铁路
同义词：
['secret railway', 'underground passage', 'underground line']
例句：
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1. The underground railroadplayed a crucial role in the Civil War era.
地下铁路在内战时期起到了关键作用。
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2.The underground railroad helped slaves escape to freedom.
地下铁路帮助奴隶逃离到自由。
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3.The underground railroad was a clandestine network of people who helped smuggled goods and people across borders.
地下铁路是一个秘密的网络，人们帮助走私货物和人员穿越国界。