《史记·七十列传·大宛列传》
乌孙在大宛东北大约二千里，是个百姓不定居一处的国家，人们随着放牧的需要而迁移，和匈奴的风俗相同。
乌孙在大宛东北可二千里，行国，随畜，与匈奴同俗。
The Wusun is about two thousand miles northeast of Dayuan, a country where people do not settle in one place, and people migrate according to the needs of grazing, similar to the customs of the Xiongnu.