这是撒哈拉大沙漠里的一块岩石画。
数千幅岩石画和雕刻增加了我们对史前时代北极地区的环境和人类生活的认识。
The thousands of paintings and engravings add to our understanding of the environment and human activities on the fringes of the Far North in prehistoric times.
研究人员最近发现，澳大利亚西部一种特殊的古岩石画依然色泽鲜艳，原因是它们是“活的”。
A particular type of ancient rock art in Western Australia maintains its vivid colors because it is alive, researchers have found.
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