An ancient monument of rough stones, with one huge flat stone resting across the others, forming a rough chamber.

上古的大石遗迹(石头排立如柱，上面放置大扁石，形状似屋)。

A circle of monoliths usu. enclosing a dolmen or mound.

(通常环列在太古坟冢或小丘四周的)史前巨石碑坊。