That group exhibited more violent behavior in the eighth year of the study than those who did not have head injuries.
在研究的第八年，那一组比没有头部受伤的人表现出了更多的暴力行为。
Head injuries may be linked with subsequent violent behavior in young people, a study finds.
一个研究表明，大脑的损伤与青年人后来的暴力行为有关。
Viewing abnormally large amounts of violent television and video games may well contribute to violent behavior in certain individuals.
观看暴力电视节目和玩暴力题材电子游戏的数量超过正常水平，很可能导致某些人的暴力行为。
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