Black bear cubs use trees for defense, whereas brown bears and polar bears, which regularly inhabit treeless environments, rely on aggression to protect their cubs.
黑熊幼崽用树来防御，而经常生活在没有树的环境中的棕熊和北极熊则依靠攻击性来保护它们的幼崽。
They explore this theory with three studies, two on helping behaviours and one on aggression.
他们用三项研究探索了这个理论，其中两项关于助人行为，一项关于侵犯。
Yet more than 40 years of research reveals that expressing anger directly toward another person or indirectly toward an object actually turns up the heat on aggression.
尽管超过四十年的研究结果表明，将怒气直接发泄到其他人身上或者间接地发泄到某一物体上，实际会起到火上浇油的后果。
Yet more than 40 years of research reveals that expressing anger directly toward another person or indirectly toward an object actually turns up the heat on aggression.
尽管超过四十年的研究结果表明，将怒气直接发泄到其他人身上或者间接地发泄到某一物体上，实际会起到火上浇油的后果。
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