《水经注·卷十三》
沧河又往西流经居庸县老城南面，那就是魏时的上谷郡治。
沧河又西径居庸县故城南，魏上谷郡治。
The Cang River flows westwards, past the southern face of the old city of Juyong County. This was the site of the Shanggu County government during the Wei Dynasty.
<s>[INST] 将以下英文转换为文言文: The Cang River flows westwards, past the southern face of the old city of Juyong County. This was the site of the Shanggu County government during the Wei Dynasty. [/INST] 沧河又西径居庸县故城南，魏上谷郡治。</s>
将以下英文转换为文言文: The Cang River flows westwards, past the southern face of the old city of Juyong County. This was the site of the Shanggu County government during the Wei Dynasty.
user
沧河又西径居庸县故城南，魏上谷郡治。
assistant