entrench|entrenched|entrenching

军队决定在阵地周围挖战壕以巩固防御。

The army decided to ___entrench their position by digging trenches around it.

他根深蒂固的偏见很难改变。

His ___entrenched prejudices are hard to change.

为了防御敌人的进攻，士兵们正在阵地上挖掘战壕。

The soldiers are ___entrenching their positions to defend against enemy attacks.