rearguard

后卫部队、殿后部队军事

The general left a rearguard to cover the army's retreat.

将军留下一支后卫部队掩护大军撤退。

顽抗、最后的抵抗多用于 rearguard action

The old guard fought a rearguard action against the reforms.

保守派针对这些改革做了最后的顽抗。

殿后的、掩护撤退的

A small rearguard force held the bridge for two days.

一支小型殿后部队守住那座桥两天。