Friendship appears to be a unique form of human bonding.

友谊似乎是人类情谊的一种独特形式。

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"If you take the promiscuity that is the main feature of chimp society, and replace it with pair bonding, you get many of the most important features of human society," he said.

“如果把杂交看做黑猩猩社会的主要特征，然后把它换成成对组合，你会得到很多人类社会的重要特征，”他说。

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In addition to being associated with sleep, both chemicals are also intimately involved in what is called "pair bonding," the social attachment human mates commonly share.

加之关系到睡眠，这两种化学物质也与所谓的“雌雄结合”密切相关——人类社会的配偶常常分享“雌雄结合”产生的感情依属。

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Someday science may reveal the whole hormonal spectrum, and we'll finally fathom which bonding decisions are choice, which (chemical) chance, and which an irreplaceably human combination of the two.

WSJ: Looking Beyond Oxytocin, the Love Drug | Marvels