公路建设与保养

例句：

1. 1. The city's new highway project is expected to improve traffic flow significantly.
   该市的新高速公路项目预计将显著改善交通流量。
2. 2. Maintaining the road condition is crucial for safe driving.
   保持道路状况对安全驾驶至关重要。
3. 3.The government has launched a campaign to encourage citizens to participate in road construction and maintenance.
   政府已启动一项活动，鼓励市民参与道路建设和保养工作。