roadbed

The earthquake made the roadbed cave in..地震后路基沉陷了。

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。

As for implanting chargers in the roadbed, that technology is "fascinating, and very expensive, " Smith says..至于在路基里埋设充电器，Smith表示这项技术“很棒，但也很贵”。

路基英释中释nthe material used to make a road