a circle of large stones, usually standing stones, put in position by people in prehistoric times (= the period before there were written records)

Avebury is the world's largest stone circle, stretching across 28 acres. 埃夫伯里有世界上最大的史前环状巨石阵，绵延28英亩。

Britain's first monuments - stone circles, lines and cairns - are almost 5,000 years old. 英国最早的纪念碑性质的建筑，即石阵、石线和石冢，有近5000年的历史。