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6.事实上，到1998年，美国大多数城市的暴力犯罪率已经下降到30多年来的最低水平，然而政客们仍然通过增加警务开支和兴建监狱来赢得公众的支持和投票。
7.Committee for the Study of the Future of Public Health.“The future of public health.”Washington, D.C.: National Academy Press, 1988.