railroad ballast铁路: railway; railroad; rail道碴: ballast aggregate; ballast铁路道岔: railroad turnout铁路道钉。: railroad spike铁路道口: level crossing; railway crossing下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:铁路道碴，即可在微信中查询翻译
