“Women seem more inclined to build and rely on only a few strong relationships, ” says Mr Seabright.

希伯莱特说：“女性似乎更想要建立或依靠少数几个强有力的关系。”

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"Women seem more inclined to build and rely on only a few strong relationships," says Mr Seabright.

“女性似乎更倾向于建立并且依赖一小部分紧密的人际关系，”西布·赖特说道。

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“ Women seem more inclined to build and rely on only a few strong relationships ,” says Mr Seabright.

“女性似乎更倾向于建立并且依赖一小部分紧密的人际关系，”西布赖特说道。

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Ms Seabright was taken to James Cook Hospital in Middlesbrough where she is in a serious but stable condition.

BBC: Colburn car checks a week after hit-and-run

Because, explains Mr Seabright, it is so much at odds with what would have seemed, as recently as 10, 000 years ago, our evolutionary destiny.

ECONOMIST: Economics focus

Two traits were needed, says Mr Seabright, to bring the fruits of co-operation within reach, and evolution had equipped humans with both accidentally, as it were.

ECONOMIST: Economics focus