osteolith

例句：

1. 1. The team discovered a rare bone fossil in the cave.
   该团队在洞穴里发现了一种罕见的骨骼化石。
2. 2.The discovery of this bone fossil has sparked new research on human evolution.
   这种骨骼化石的发现激发了对人类进化的新研究。
3. 3. The ancient bones are believed to have been used for making tools by early humans.
   这些古代骨头被认为曾被早期人类用作制作工具。