他们是猴子。
如果猴子摸的是屏幕的左边，他们会得到七滴水或果汁的奖励。
If the monkeys touched the left side of the screen they would be rewarded with seven drops of water or juice.
确实，我们对模仿的喜爱可能是出自一种求生方面的好处，它深深根植于我们的进化生物学中，甚至连猴子也更喜欢与模仿他们的人打交道。
Indeed our fondness for imitation may be a survival advantage, deeply rooted in our evolutionary biology - even monkeys become more willing to engage in a kind of commerce with those who imitate them.
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