road maintenance

例句：

1. 1.The road maintenance crew is responsible for keeping the roads in good condition.
   道路维护团队负责保持道路良好状态。
2. 2. The city government has been investing heavily in road maintenance to improve safety.
   市政府一直在大力投资于道路维护以提高安全性。
3. 3. Maintenance of the road network is crucial for efficient traffic flow.
   维护道路网络对于高效的交通流动至关重要。