警方正在严厉打击城市中的毒品贩运。

Police are ___cracking ___down on drug trafficking in the city.

新市长承诺要严厉打击有组织犯罪。

The new mayor promised to ___crack ___down on organized crime.

为了提高安全性，学校决定严厉打击欺凌行为。

To improve safety, the school decided to ___crack ___down on bullying.