two-course concrete pavement

例句：

1. 1. The newtwo-course concrete pavement isexpected to improve traffic flow.
   新的双层混凝土人行道预计将改善交通流量。
2. 2. Theconstruction of the two-course concrete pavement hasbeen completed.
   双层混凝土人行道的建设已经完成。
3. 3.The two-course concrete pavementprovides a smooth and safe surface for pedestrians.
   双层混凝土人行道为行人提供了一个光滑且安全的地面。