In evolutionary terms, the ability to control aggression in another animal can have major value, Sobel pointed out.

索贝尔指出，从进化方面来讲，控制对另一个动物的攻击性有很大的价值。

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The findings mark a milestone in an unlikely new animal model for understanding the biology of aggression and how the nervous system gives rise to different behaviors.

这个发现成为里程碑性的标志，它为攻击行为的生理学研究和神经系统是怎样引发不同行为的研究提供了可能的新型动物模型。

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This type of aggression occurs when an animal learns that aggression results in positive reinforcement.

有机体由于攻击行为的结果所获得正强化， 因而令该个体的此行为获得加强。

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Excessive grooming can be a symptom of obsessive-compulsive disorder, aggression and violence can indicate anxiety, and a refusal to eat can suggest depression in an animal.

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