《汉书·传·匈奴传上》
当初的时候，单于爱好汉朝的绸绢、丝棉和食物，中行说对单于说： 匈奴的人比不上汉朝的一个郡，然而却很强大的原因，便是穿衣吃饭与汉人不同，没有什么需要仰赖汉朝的。
初，单于好汉缯絮食物，中行说曰： 匈奴人众不能当汉之一郡，然所以强之者，以衣食异，无仰于汉。
In the beginning, the Xiongnu king loved Han Dynasty clothing, food, and other items. Zhonghang Shuo told him: The people of Xiongnu are not as strong as one county of Han Dynasty. This is because you have changed the traditions of Xiongnu and now like the items of Han Dynasty. Now the items of Han Dynasty only take up one-tenth of what Xiongnu has, and you have received all of them.