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科学家说，笑并非人类独享的专利，而是人类和许多灵长类“堂兄弟”共同拥有的特性。“笑”是灵长类进化的独有成果，使得灵长类化解内部矛盾“一致对外”，从而在大自然的残酷竞争中取得群体优势。殊不知，在自然

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