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人脑最近一次扩展至今已有大约 3 0 0万年的历史。生物进化研究人员根据人脑发展的历史足迹 ,从生态和社会原因两方面进行了探讨———
The most recent expansion of the human brain has now been about 30 million years old. According to the historical development of human brain, researchers of biological evolution have discussed both ecological and social reasons ---