警方正在调查这起涉及刀具斗殴的街头暴力事件。

The police are investigating the street violence involving ___knife-fighting.

她在武术学校学习刀法用于自卫。

She learned ___knife-fighting at the martial arts school for self-defense.

政坛上的刀光剑影让许多新人对从政望而却步。

The constant ___knife-fighting in politics discourages many newcomers from entering the field.