Paleolithic:
The Palaeolithic (British spelling; US spelling: Paleolithic; pronunciation: /ˌpæliɵˈlɪθɪk/ or /ˌpeɪl-/) Age, Era or Period is a prehistoric period of human history distinguished by the development of the most primitive stone tools discovered (Grahame Clark's Modes I and II), and covers roughly 95% of human technological prehistory.
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旧石器时代:
旧石器时代在古地理学上是指人类开始以石器为主要劳动工具的文明发展阶段，是石器时代的早期阶段。
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Paleolithic旧石器时代