used to describe something that is very basic, simple, and not well developed:
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Crude and basic
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the early period in human history when people made tools and weapons only out of stone:
Prehistory
英语词典包含110679条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。