名词短语
中文翻译：额外运行的火车同义词
同义词：
['extra train', 'additional train']
例句：
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1. Theextra train service is a great way toget around the city on short notice.
额外的火车服务是短途旅行的好方法。
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2. Theextra train will be running at an hourearlier than usual.
额外的火车将比平时早一个小时运行。
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3. The extra train was so crowdedthat it took us over two hours toreach our destination.
额外的火车非常拥挤，我们花了两个多小时才到达目的地。