雅思写作高频词汇介绍之公共安全

　　public safety[公共安全]

　　-eg: An increasing number of cameras are being installed, but is public safety really improving?;

　　crack down[对...采取严厉措施]

　　-eg: crack down youth crime/counterfeit goods[打击青少年犯罪/打假];

　　uncontrolled[失控的]/out of control。