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I did not claim that speciation occurs only in founder populations.

  • -- Ernst Mayr 迈尔

我并不是说物种形成只发生在创始人群体中。

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Population

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Of course, a positive growth rate might be taken as evidence that a population is below its optimum.

当然，正增长率可以作为人口低于其最佳水平的证据。

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The middle class, in the white population, encompasses a wide swath.

在白人人口中，中产阶级的范围很广。

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