因此，罗川古城是庆阳境内设县最早、延续时间最长的县治。

Therefore, the ancient town of Luochuan was the earliest county in Qingyang.

youdao

因此，罗川古城是庆阳境内设县最早、延续时间最长的县治。

Therefore, the ancient town of Luochuan was the earliest county in Qingyang.

youdao