The troops were entrenched near the mountains.

部队在群山边筑起壕沟以防卫自己。

I clambered out of the trench.

我费力地爬出壕沟。

Consisting of concentric circles of stone surrounded by a moat (called a "henge"), Stonehenge was constructed in several stages over thousands of years.

由壕沟包围几圈巨大同块组，巨造持续了数千年时间。