另一方面，有证据显示人类的暴力是一种习得行为。
On the other hand, human violence shows evidence of being a learned behavior.
联邦调查局（FBI）最近报告显示，2008年暴力犯罪比2007年下降了2.5%。
The most recent report from the FBI shows that during 2008 violent crime dropped by 2.5% compared with 2007.
美国科学家最新公布的一项研究显示，对于那些在分娩结束1年后出现心理异常、故意毁坏物品以及出现家庭暴力行为的母亲来说，她们的孩子长到3周岁时出现行为方面问题的可能性高。
The children of mothers who have mental health, substance abuse or domestic violence problems a year after delivery are more likely to experience behavioral problems at age 3, a U.S. study finds.
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