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They were sophisticated tool makers with high social and cognitive skills.
他们具有高度的社交及认知能力，制造工具非常有经验。
youdao
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The evolution of the thumb allowed human beings to become tool-makers.
拇指的进化使人类成为工具制造者。
youdao
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The evolution of the thumb allowed human beings to become tool-makers.
拇指的进化使人类成为工具制造者。
youdao