Archaeologists set out recently to unlock one of the secrets of Stonehenge, the majestic monument in southern England-when were the first standing stones placed at the ancient religious site?

• 最近，考古学家们试图揭开巨石阵的秘密。面对英格兰南部的这座宏伟石碑群，这个神秘、古老的宗教遗迹，第一块石柱是什么时候竖立的？