railway road-bed的用法和樣例：
例句
- Repair of the railway roadbed is in Sukhumi to Ozzie Muqi La carried out by the railway line.
修復鐵路路基的工作是在蘇呼米至奧齊姆奇拉鐵路線上開展的。 - The harmony of it, the tracker superstructure, the tunnel and bridge structures is the one of the key problems in the railway modernization.
隨著高速鐵路和快速客貨混運技術的發展人們意識到提高鐵路路基壓實標準，使之與線路上部結構和橋隧建築物的標準相協調是鐵路現代化的關鍵問題之一。
