本文还对形成差异的原因进行了简要分析。

Reasons of the differences are also analyzed in this paper.

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此物种非常年轻，所以没有什么时间形成差异。

The species is young, so there has been little time for differences to evolve.

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正文第四部分分析了中美两国形成差异的原因。

The fourth Part of the text analyzes the reasons for the differences between China and the US in this respect.

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