And when these groups were set in competition against each other, the Eagles versus the Rattlers, the within-group intensity grew.

当这两队小男孩,要与另一队互相竞争时，老鹰对响尾蛇，这种群内感情开始变强烈。

耶鲁公开课 - 心理学导论课程节选

it all evolved into hostilities, raids and violence.

最后两队打起来了。

耶鲁公开课 - 心理学导论课程节选

So, these groups developed different cultures.

两队形成了不同的文化。

耶鲁公开课 - 心理学导论课程节选