For such reasons, we can assume that there must be an important random factor in neural development, and in particular, that errors must and do occur in the development of all normal brains.
基于这些原因，我们可以假设在神经发育过程中一定存在一个重要的随机因素，特别是在所有正常大脑的发育过程中确实也会发生错误。
Men’s brains are about 10 percent larger than women’s, overall, so any comparison of specific brain regions must be scaled in proportion to this difference.
而这个区域在人脑中所占的比率，女性要比男性多（总体而言，男性大脑比女性大10%，所以凡与大脑区域相关的比较，都按其在各自大脑所占的比率换算）。
So the first guess might be that animals that have bigger brains must be smarter.
所以，第一个猜想可能是动物的脑袋越大越聪明。
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