Paleolithic man could only make the most basic stone tools.
旧石器时代的人类只能制造最简单的石器。
Paleolithic man waited by caves for the realization of why he was there, and hunted;
旧石器时代的人在洞中等待明白他为什么在那儿，并且打猎；
The gradual-adaptation principle is deeply rooted in human physiology, and has worked for about a billion runners since Paleolithic man started stalking wild animals in East Africa 150,000 years ago.
逐渐适应的原则是基于人类心理学，自从15万年前的旧石器时代人开始在东非潜伏跟踪野生动物开始，这条原则已在大约一百万跑步者身上发生作用。
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