名词
中文翻译：铁路滚动
同义词：
['rolling train', 'rolling stock']
例句：
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1. The train was rolling along the tracks when it hit a bump.
火车在轨道上行驶时撞到了一个坑。
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2. The rolling stock is being inspected for safety before it can leave the station.
火车头在离开车站之前正在接受安全检查。
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3. The rolling stock needs to be replaced every six months.
火车头需要每六个月更换一次。