《汉书·传·西域传上》
从大宛往西到安息国，沿途居民虽然语言有差异，但大同小异，彼此能通晓意思。
自宛以西至安息国，虽颇异言，然大同，自相晓知也。
From Dayuan west to the land of Anxi, the people of the cities along the way mostly have languages that differ, but the main dialects are not very different, so they can usually understand one another.