noun · a person who speaks their mind boldly and frankly, often with a sharp or aggressive tone

她在座谈会上直言不讳，是大家公认的小钢炮。

a high-performance hatchback car or, figuratively, any small but powerful piece of equipment

这台车虽然体积不大，但动力极强，是一辆名副其实的小钢炮。

a piece of light artillery, such as a mortar

战士们架起小钢炮，向敌方的阵地发起进攻。