US crime levels have fallen to their lowest reported levels in nearly half a century despite major unemployment and the worst economic downturn since the Great Depression. Even more remarkably, the drop was steepest in America’s big cities – which are still popularly believed to be cauldrons of criminality. The question is: why?
雖然美國正面臨著嚴重的失業問題和經濟大蕭條(Great Depression)以來最嚴峻的經濟下滑，但它的犯罪率現在卻降至近半個世紀以來有報告的最低水準。更加值得注意的是，雖然美國大城市仍被普遍認爲是犯罪的溫牀，但那裏的犯罪率下降卻最爲明顯。原因何在？
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