trench [trentʃ]

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n.(挖)沟，(挖)战壕；vi.挖战壕；侵害；vt.掘沟

a narrow hole which is dug into the ground

The soldiers recaptured their trench. 兵士夺回了战壕。
The troops received orders to trench the outpost. 部队接到命令在前哨周围筑壕加强防卫。