一些研究人员解释了大多数人是如何与同龄人形成社会群体的。
Some researchers explain how most people form their social groups with people of their age.
这是一种常见的现象，但研究人员并不能很好地解释它。
It's a common thing, but researchers don't have a good explanation for it.
有好几种因素可以解释这种倾向，研究人员说。
Several factors might explain this trend, the researchers say.
研究人员认为，这或许可以解释为什么印加文明在那几个世纪中得到了扩张。
That may explain the Inca civilization's expansion during those centuries, researchers suggest.
研究人员承认他们无法解释这种差异。
The researchers admitted they could not explain this differential.
研究人员承认他们无法解释这种差异。
The researchers admitted they could not explain this differential.
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