It noted the United States has the largest prison system in the world, with the highest inmates-to-population ratio.

他提醒美国拥有世界上最大的监狱系统和最高的犯罪率。

youdao

The country which has taken this furthest is the United States, where the prison population has quadrupled over the past three decades to 1.6m, and where crime rates have recently been falling in many big cities.

ECONOMIST: Crime

In fact, the state has been forced by the United States Supreme Court to reduce the prison population to more manageable levels.

BBC: Viewpoint: Justice for Conrad Murray