Millions of years ago, people lived in caves.
数百万年以前，人们生活在洞。
Primitive people lived in caves and made tools from stones and animal bones.
原始人住在洞穴里并以石头和动物的骨来做工具。
People lived in caves in prehistoric times. Scientists have learned much about early man by digging in cave floors and studying the artwork on walls and ceilings.
史前时期，人们居住在洞穴里。科学家挖掘洞穴地面，研究墙上和洞顶的艺术品，对早期人类已经知之甚多。
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