在一些古代文化中，他们会通过让尸体自然分解来完成骨骼清理仪式。

In some ancient cultures, they practiced ___excarnation by leaving bodies to decompose naturally.

考古学家发现了一些经过剔肉处理的古代骨骼。

The archaeologists found ancient bones that had undergone ___excarnation.