《后汉书·列传·乌桓鲜卑列传》
上天创设的山河，秦修筑长城，汉建造边关城墙，都是用来分开国内国外，区别不同的习俗。
天设山河，秦筑长城，汉起塞垣，所以别内外，异殊俗也。
The mountains and rivers created by God, the Great Wall built by Qin, and the border walls built by Han were all used to separate the country from abroad and distinguish different customs.
<s>[INST] 将以下英文转换为文言文: The mountains and rivers created by God, the Great Wall built by Qin, and the border walls built by Han were all used to separate the country from abroad and distinguish different customs. [/INST] 天设山河，秦筑长城，汉起塞垣，所以别内外，异殊俗也。</s>
将以下英文转换为文言文: The mountains and rivers created by God, the Great Wall built by Qin, and the border walls built by Han were all used to separate the country from abroad and distinguish different customs.
user
天设山河，秦筑长城，汉起塞垣，所以别内外，异殊俗也。
assistant