n.下层通道，地下通道(在另一条道路或铁路之下)

原形：underpass复数：underpasses

The car had to slow down as it approached the underpass.
汽车接近地道时不得不减速。
The train sped through the underpass beneath the city.
火车快速穿过城市下方的地道。
The underpass was illuminated by dim streetlamps.
地道里只有微弱的路灯照明。
There was a traffic jam at the entrance of the underpass.
地道入口处发生了交通堵塞。
Cyclists must dismount before entering the underpass.
骑自行车的人在进入地道前必须下车。
The underpass provided a shortcut for local residents.
这个地道为当地居民提供了一条捷径。
The underpass was constructed to alleviate traffic congestion.
建造这个地道是为了缓解交通拥挤。
The graffiti on the walls of the underpass added a splash of color.
地道墙上的涂鸦增添了几分色彩。
Pedestrians should exercise caution when using the underpass after dark.
夜晚使用地道时，行人应格外小心。
The underpass was closed temporarily due to maintenance work.
由于维修工作，地道暂时关闭。