空军发动了一场持续的轰炸行动。

The air force launched a sustained bombing ___campaign.

历史学家们仍在研究亚历山大大帝的军事战役。

Historians still study the military ___campaign of Alexander the Great.

将军策划了一场决定性的战役，以期迅速结束冲突。

The general planned a decisive ___campaign to end the conflict quickly.