The idea and practice of "prevention room", also called "environment prevention", is one of the major contents of crime prevention in modern cities.

在现代城市犯罪预防对策中，“防卫空间”思想及实践是其一项重要内容。

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But broadcasting bird song meshes with the concept of crime prevention through environmental design, he says, in which cities might improve lighting or play cheerful music in public spaces.

WSJ: A California City Is Into Tweeting��Chirping, Actually��in a Big Way