palaeolithic

例句：

1. 1. The paleolithic tools found in the cave are fascinating to study.
   在洞穴中发现的石器时代工具令人着迷。
2. 2.The paleolithic era is often used as a reference point for understanding human evolution.
   石器时代经常被用作理解人类进化的一个参考点。
3. 3. Paleozoic eras are characterized by the appearance of dinosaurs and other ancient creatures.
   古生代时期以恐龙和其他古代生物的出现为特征。