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人类基因和表型的多样性呈现距离非洲越远则越少的趋势。奥克兰大学的阿特金森(Quentin Atkinson)发现在现代语言中,距离非洲越远地区的语素(语言的最小单位)也越少。含有最多音素的方言存在于非洲所说的语言之中,而所含音素最少的口语
The diversity of human genes and phenotypes tends to be less as they move from Africa. Quentin Atkinson of the University of Auckland found that in modern languages, morphemes (the smallest units of language) farther away from Africa are less. The dialect containing the highest number of phonemes exists in the language spoken in Africa and the dialect containing the fewest phonemes