roadbed
n. 路基；车行道
例句
The earthquake made the roadbed cave in.
地震后路基沉陷了。
《新英汉大辞典》
The application of dynamic consolidation in roadbed engineering is analyzed.
分析了强夯在路基工程中的应用。
Climbing quickly down a steel ladder, he paused at the bottom, two feet above the roadbed flashing by.
他疾速攀下铁梯，停在梯子最后—级上，离他脚下飞速掠过的铁路路基有两英尺。
