In recent years ,American crime rate has obviously risen except 3 bigger cities ,N.Y.,L.A.,Chicago.Why?
In recent years ,American crime rate has obviously risen except 3 bigger cities ,N.Y.,L.A.,Chicago.Why?
美国的犯罪率最近几年除了纽约,洛杉矶,芝加哥三个大城市之外都有明显的上升.这是什么原因呢?