上海市是一个省级单位，有19个县级行政区域。包括18个区和1个县。
Shanghai is administratively equal to a province and is divided into 19 county-level divisions: 18 districts and 1 county.
国省干线公路网络不断完善，连接了全国县级及以上行政区。
The national and provincial trunk highway network has been improved, connecting administrative regions at and above the county level nationwide.
国省干线公路网络不断完善，连接了全国县级及以上行政区。
The national and provincial trunk highway network has been improved, connecting administrative regions at and above the county level nationwide.
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