例句
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”。