1引言1 Introduction在美国,每年有超过18万人死于各类伤害,也就是说,每3分钟就有1人因此丧命。暴力与伤害威胁着每个人,无论性别、种族或贫富。在1~44岁年龄段的美国人中,死于机动车事故、跌倒或凶杀等暴力和伤害的人数比所有由于其它原因死亡的人数 1 Introduction 1 Introduction In the United States, more than 180,000 people die each year from injuries, which means one person dies every three minutes. Violence and injuries threaten everyone, regardless of gender, race or wealth. Among Americans ages 1 to 44, the number of violent deaths and injuries caused by motor vehicle accidents, falls or homicides was less than the number of all those killed for other reasons