crime prevention

例句：

1. 1. The city government has launched a campaign to prevent crime in the downtown area.
   市政府启动了一个活动，旨在防止市中心的犯罪。
2. 2. The police department is working on a new program to prevent crime in schools.
   警察局正在开发一个新的项目，旨在防止学校中的犯罪。
3. 3. Crime prevention is essential for maintaining public safety and preventing social unrest.
   预防犯罪对于维护公共安全和防止社会动荡至关重要。