名词
中文翻译：Unknown
同义词：
['trolley car', 'trolley locomotive']
例句：
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1. The pantograph wasused to pull the train up the steepincline.
火车头被用来把火车拉上陡峭的斜坡。
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2. Thepantograph was acrucial part of the railway system.
火车头是铁路系统的关键部分。
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3.The pantograph was designed to improveefficiency and safety on the tracks.
火车头的设计是为了提高轨道上的效率和安全性。