一般来说，在规范的保险市场，保险公司之间死差和费差差异不大，红利主要来源于利差收益。

Generally speaking, in the standard insurance market, between the insurance company the dead difference and spends the difference difference not to be big, dividend important source in spread income.

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后来，其他研究人员测量了密度差，发现了一个显著的差异。

Later, other researchers measured the density differential and found a significant difference.

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现在我们的研究发现家境差的孩子（和富裕家庭的孩子对比）在大脑额叶对刺激的反映有着机能上的差异。 这是明确的事实。

But the fact that we see functional differences in prefrontal cortex response in lower socioeconomic status kids is definitive.

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