"凋零堡垒" 的英文翻译是 "Withering Siege."

这个词的来源可能源于一种策略游戏，其中玩家需要在攻击和防御之间进行战略决策。在这种情况下，"凋零堡垒" 可能指的是一种攻击策略，其中攻击者试图通过不断攻击堡垒来使其越来越弱，最终摧毁它。

下面是一些英文例句，以及它们的中文翻译：

The attackers used the withering siege strategy to weaken the fortress over time, until it finally fell.
(攻击者使用凋零堡垒策略来逐渐削弱堡垒，直到最终倒塌。)

The defenders knew they couldn't withstand the withering siege for much longer, so they made the decision to retreat.
(防御者知道他们不能再承受凋零堡垒的攻击了，所以他们决定撤退。)

The withering siege tactics were successful, and the enemy's stronghold was finally breached.
(凋零堡垒策略成功了，敌人的据点终于被攻破了。)