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Researchers have shed light on the chemistry that bonds one person to another by taking brain scans of men being stroked while in their underpants. 据英国《卫报》报道，研究者在对大脑进行扫描时发现，当男性穿着内裤被女性抚摸时，大脑皮层会分泌一种化学物质，增强双方关系。 The Finnish study found that gentle stroking – which was not in sexually arousing areas – changed levels of opioid brain chemicals which work behind the scenes to form lasting bonds in animals. 芬兰科学家研究发现普通程度的抚摸——不触及性敏感地带——将会改变大脑内阿片类化学物质（ opioid brain chemicals）的分泌程度，这些分泌物会在动物体内起到促成长久联系的作用。 The findings suggest that opioids might be the critical chemicals that enables human brains to distinguish between strangers and people who are closer to us, such as friends, families and lovers. 研究表明，阿片类物质可能作为一种非常重要的化学物质，帮助人类大脑区别陌生人以及关系亲密的人，诸如朋友、家人和恋人。 "We know this is hugely important for humans because we have these strong, lasting bondings with friends and relatives and so on. But what kind of system maintains these bonds, and makes them last?" said Lauri Nummenmaa who studies the neural circuitry of emotions at Aalto University in Finland. | 
