认知的流动性解释了艺术、宗教和复杂的语言的出现。
Cognitive fluidity explains the appearance of art, religion, and sophisticated speech.
可能在人口流动性方面最具说服力的标志是，公元前3000年，在这片广袤的土地上大部分牧民讲的相关语言，现代印欧语系就从中发展而来。
Perhaps the most striking sign of mobility is the fact that by the third millennium B.C., most pastoralists in this huge region spoke related languages ancestral to the modern Indo-European languages.
语言一直都在变化：那是条流动的溪水，不停地在转换、变换，接受千条支流的新生力量，丢弃旧形式。
The language is perpetually in flux: it is a living stream, shifting, changing, receiving new strength from a thousand tributaries, losing old forms in the backwaters of time.
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