空军执行了一场持续的轰炸战役。

The air force conducted a sustained bombing ___campaign.

历史学家们仍在争论亚历山大大帝波斯军事行动中使用的战术。

Historians still debate the tactics used in Alexander the Great's Persian ___campaign.

将军计划发动一场冬季军事行动，以突袭敌军。

The general planned a winter ___campaign to surprise the enemy forces.