Fear seems to play a role.

恐惧似乎发挥了作用。

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The longevity dividend seems linked to something in the female genome, and though it's not clear what that critical variable is, size of the animal may play a role.

女性在长寿上的优势似乎与女性特有的基因有关，但确切的机理，或者说到底是什么关键性的原因导致了这样目前还不清楚。

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“Partisan taunting seems to play a central role in the behavior of many senators, ” declared the study, by Justin Grimmer of Stanford and Gary King of Harvard.

斯坦福大学教授贾斯汀·格里默和哈佛教授格雷·金在研究中表示，“对大多数议员来说，党派嘲讽似乎成了项重要内容。”

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Milk, liver, peanuts and eggs also are naturally rich in choline, and studies have shown that it seems to play a role in metabolism, cell structure to the workings of brain neurotransmitters.

MSN: Some so-called 'dude foods' may not be so bad

Delta has remained mostly mysterious, but seems to play a key role in heart disease.

FORBES: Of Marathon Mice And Fat Men

As First Lady, she has her campaign against childhood obesity, and seems to play a pleasant admonitory role in a solid marriage.

NEWYORKER: State of the Union