《史记·七十列传·匈奴列传》
公卿们都说： 单于刚打败月氏，正处在胜利的有利时机，不能攻打他，况且得到匈奴的土地，都是低洼盐碱地，不能居住。
公卿皆曰： 单于新破月氏，乘胜，不可击。且得匈奴地，泽卤，非可居也。
The officials all said, "The Chanyu has just defeated the Yuezhi and is at the peak of his victory. We cannot attack him. Moreover, the land that we would gain from the Xiongnu is all low-lying and saline, and unsuitable for habitation."