To dig trenches 挖掘堑壕
We must dig trenches to drain the water away.
社员们冒雨开沟排水。
To install the civilian BPP, you would dig two trenches on opposite sides of a river and insert a lightweight anchor into each.
要安装平民版BPP，你需要在一条河两边挖两条沟，每条沟里插一个轻量级的锚。
Tractors that should now be ploughing land for sowing winter grain have been mobilised to dig trenches round fields to stop forest fires encroaching on farmland.
本来应该开垦土地、播种冬季作物的拖拉机，现在被用来挖掘防火沟，以防止大火蔓延到农田。
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