In their efforts to reduce crime the government have expanded the police force.

为了减少犯罪，政府扩大了警力。

It calls for drug policies based on methods empirically proven to reduce crime and promote economic and social development.

该报告呼吁，禁毒政策应采用实际经验有效，能够减少犯罪、推动经济社会发展的方法。

Collectively we can grow pessimistic-about the direction of our country or the ability of our leaders to improve education and reduce crime.

总体而言我们会变得悲观—对我们国家的走向，或是领导人改善教育，减少犯罪的能力。

We must take preventive measures to reduce crime in the area.

我们必须采取预防措施来减少这个地区的犯罪。

And planting trees in urban environments has even been found to reduce crime.

人们发现，在城市中植树甚至还减少了犯罪。