名词
中文翻译：Unknown
同义词：
['railway', 'railway system', 'rail transport']
例句：
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1. The RER line runs through the heart of Paris, connecting major cities.
RER线路贯穿巴黎中心，连接主要城市。
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2. The new high-speed rail service is expected to improve travel times between major cities.
新的高速铁路服务预计将改善主要城市之间的旅行时间。
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3. The RER trains are reliable and efficient, making them a popular choice for commuters.
RER列车可靠且高效，是上班族的热门选择。