名词
中文翻译：铁路轨道床
同义词：
['trackbed', 'railbed']
例句：
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1.The train was traveling on the railroad bed.
火车正在铁轨上行驶。
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2.The engineer inspected the railroad bed for any damage.
工程师检查了铁路轨道是否有损坏。
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3.The railway company is responsible for maintaining the railroad bed.
铁路公司负责维护铁路轨道。