当人们生活在一些陌生的社会环境中，讲故事就是人们相互确认身份，建立一个团结社会的方式。
It is a way for people to establish their identities in often unfriendly areas as they struggle to hold their communities together.
当说起陌生人，研究表明，人们认为别人的动机比他们的本性更加自私，实际上更加帮不上什么忙。
When thinking about strangers, studies have shown that people think others are more selfishly motivated than they really are and that others are less helpful than they really are.
他们发现当人们试图在一个陌生环境中睡觉时，大脑的一半比另一半更加清醒。
They found that one-half of the brain "remains more awake" than the other half when people are trying to sleep in a new place.
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