A long barrow is an extended earth mound, with either a stone or timber burial chamber inside.

长公墓是一个延长的土堆，里面有一个石头或木头的墓室。

Cahokia may have had as many as 20000 people living a town centered around a huge earth mound which exists to this day.

卡俄基亚人已经有2万人居住在以土丘为中心的镇上这到现在还存在。

Later on in the period, they built more mysterious monuments, including the massive earth mound at Silbury Hill, and, most famously, circles from stone and wood, like Castlerigg, Woodhenge, Avebury and Stonehenge.

在接下来的时期，他们建造了更多神秘古迹，包括位于西尔布利山巨大的土丘，和著名的石圈和木圈，像是卡塞里格石圈、巨木阵、埃夫伯里墓群和巨石阵。