《资治通鉴·汉纪·汉纪二十一》
匈奴前来侵扰，缺少隐蔽之地。边塞之南，道路深远，山谷起伏，往来十分困难。边塞老一辈的人说： 匈奴丧失阴山之后，每次经过那里都伤心痛哭。 
边长老言： 匈奴失阴山之后，过之未尝不哭也。 
When the Huns came to invade, there was not enough cover. The roads to the south of the border were far-reaching, and the mountains and valleys were undulating, which made it very difficult to come and go. The older generation of people on the border said: After the Huns lost Yinshan, they would shed tears of sadness every time they passed by.