这座桥是当地重要的交通枢纽。

This bridge is an important ___transportation hub for the locals.

这个城市需要改善公共交通系统。

The city needs to improve its public ___transportation system.

城市需要改善公共交通系统以减少交通拥堵。

The city needs to improve its public ___transportation system to reduce traffic congestion.

这个城市的公共交通系统非常高效。

The city's public ___transportation system is very efficient.