The researchers said part of one megalith helped solve the mystery.

数千年前，们用这些石头建造标记、纪念碑和其他建筑物。

These floating megaliths drift sometimes for months before they slowly melt away.

这些飘流的巨物有时需数月之久才能慢慢消融。

The Los Angeles County Museum of Art (LACMA) has acquired an ambitious new director and some rich patrons, and it carefully planned the $10m logistical effort needed to move the “megalith”.

洛杉矶艺术博物馆刚迎来一位雄心勃勃的新馆长和几位富有的赞助，它周密规划了一个耗资一千万美元的物流方案来拖运这个“巨石”。