formation of variety造句

"formation of variety"是什么意思

造句与例句手机版

:" [ What was done for animals artificially ] seems to be done with equal efficiency, though more slowly, by nature, in the formation of varieties of mankind, fitted for the country which they inhabit.
It's difficult to see formation of variety in a sentence. 用formation of variety造句挺难的

相邻词汇

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