A sound system of law enforcement is necessary because poorly enforced laws cause crime and violence.

我们有必要创造一个健全的执法体系，因为执行不力的法律会带来犯罪和暴力。

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But few studies have established that less education is actually a cause of crime.

但是，并没有任何一份研究表明没文化是犯罪的根源。

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Wesley Skogan, a criminologist at Northwestern University, reckons such methods are the most likely cause of the continued drop in big-city crime.

西北大学犯罪学专家Wesley Skogan认为这种做法正是大城市发罪率持续下降的最可能的原因。

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But a big cause of the crime drop seems to be that the police were able to draw on a hitherto overlooked pool of local wisdom.

ECONOMIST: Policing

Yet research has also shown that local economic booms (especially when caused by the introduction of gambling casinos into a depressed region) can actually cause certain sorts of crime to rise.

ECONOMIST: Defeating the bad guys

Then when we needed someone to push the cause of inner city children struggling to avoid a life of crime, or to bring the benefits of high technology to ordinary Americans, or to clean the environment in a way that created new jobs, or to give small businesses a better chance to make it, John Kerry said: Send me.

CNN: Clinton: Time again to choose a more perfect union