沙发冲浪者视自己为一个部落的成员；不像在酒吧里面邂逅的两个人，他们是在利他主义的前提下相遇。

Couch surfers tend to see themselves as part of a tribe; unlike two people hooking up at a bar, they meet under an altruistic premise.

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试想你希望你部落的成员应有的特质。

Think of the qualities you want your tribe members to have.

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亚马逊部落的成员在大于三或四的数目方面也有困难。

Members of the Amazonian tribes also had trouble matching Numbers larger than three or four.

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