敌军在边境地区发起了猛烈的炮火轰击。

The enemy unleashed a fierce ___barrage across the border region.

演讲结束后，观众连珠炮似的提问让他应接不暇。

After the speech, he was hit by a ___barrage of rapid-fire questions from the audience.

这个水坝的主要功能是调节河流的水位。

The main purpose of this ___barrage is to regulate the river's water level.