士兵们准备发射大炮来轰击敌军的防线。

The soldiers prepared to fire the ___cannons at the enemy's defense line.

游乐园里的空气炮把泡沫球射向孩子们。

The amusement park's air ___cannon shoots foam balls at the kids.

那位足球运动员一记重炮轰门直挂球门死角。

The soccer player blasted a ___cannon of a shot into the top corner.