Researchers don't know why brains might be shrinking, but some theorize that they're evolving to be more efficient.
研究人员还不清楚为什么人类的大脑会越来越小，但有些人提出理论说，大脑正在向高效性进化。
She concluded, "Essentially, the brains of primates and cetaceans arrived at the same cognitive space while evolving along quite different paths."
她总结说，“灵长类动物和鲸类的大脑的认知能力基本上处在同一是水平，只是进化方式截然不同。”
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