你可以走过街天桥过马路。

You may cross the street by the footbridge.

城里在公路上建了一座过街天桥。

The city built a pedestrian overpass over the highway.

你走你的过街天桥，我过我的地下通道。

You walk you of the street to the bridge, I had my underground passage.

正确的解决办法是在大城市里建造更多的立交桥，过街天桥和地道桥。

The right solution is to lay down more gallop Bridges, overpasses and underpasses in big cities.