translation.en: And they found things like, when you see crystal meth on the street, if you add police presence, you can curb the otherwise inevitable spate of assaults and robberies that would happen.
translation.zh: 他们发现 当街上出现大麻 如果加强警员巡逻 就能抑制比如那些可能发生的 攻击和抢劫事件的犯罪。