Other major cities have higher crime rates, too.
其他主要城市的犯罪率也比它高。
Police blame higher crime rates on irresponsible parents who allow their teenage children to stay out all night.
警方把犯罪率上升归因于不负责任的家长,他们任由自己十多岁的孩子在外彻夜不归。
Working out whether deploying more policemen reduces crime, for example, is confused by the fact that more policemen are allocated to areas with higher crime rates.
举例来说,研究“部署更多的警察是否有助于减轻犯罪”这一课题时,很容易忽视“犯罪高发地区的警察往往更多”这一事实。
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