Early toolmakers were 'engineers' 远古时期的工具制造者是“能
Early modern humans in South Africa were using "heat treatment" to improve their stone tools about 72,000 years ago, according to new research.
最新研究显示，72000年以前南美洲早期现代人类就已经使用“热处理”来加强他们的石头工具。
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Early toolmakers were 'engineers' 远古时期的工具制造者是“能
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