名词
中文翻译：地铁
同义词：
['subway', 'subway system', 'metropolitan rail transit']
例句：
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1. The city's new metro line is expected to open in 2025.
预计该市新的地铁线路将于2025年开通。
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2.The metro station is located just a few blocks away from the city center.
地铁站距离市中心仅几个街区。
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3. Metro travel can be faster and more efficient than driving alone.
与单独驾车相比，乘坐地铁旅行更快且更高效。