Two levels of prevention 二级预防
Multiple Levels of Prevention Activity 预防措施的多个层面
levels of prevention
预防水平
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Depressive symptoms stand out as particularly strong predictors of youth violence and aggression, and therefore current levels of depression may be a key variable of interest in the prevention of serious aggression in youth.
FORBES: Videogames did not cause the Connecticut shooting
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