The majority of our functional brain is distributed over the outer surface layer of the brain, and to increase the area that's available for mental capacity, the brain surface is highly folded.
我们大脑的主要功能 是分布在大脑 的外表面层。 从心理的能力来说要去增加这个区域是可能的， 大脑表面充满了褶皱。