prehistory
noun [ U ] uk/priːˈhɪs.tər.i/ us/priːˈhɪs.t̬ɚ.i/
（有文字记载以前的）史前史，史前阶段
the period of human history before there were written records of events
Human prehistory is divided into three successive periods: the Stone Age, the Bronze Age, and the Iron Age. 人类的史前史可以分为3个相继时期：石器时代、青铜时代和铁器时代。