单词 | railroad bed |
例句 | DEFINITIVE EXAMPLES 权威例句〔metal〕Broken stones used for road surfaces or railroad beds.筑路碎石:用于铺路面或用于填塞铁轨枕木间空隙的碎石美国传统〔tie〕One of the beams, usually made of wood, that are laid across a railroad bed to secure the rails.枕木:横放在铁路基上以固定铁轨的梁中的一根,通常为木制美国传统 |
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