And mammals got bigger, their brains got bigger at an even faster pace, and the neocortex got bigger even faster than that and developed these distinctive ridges and folds basically to increase its surface area.
哺乳类动物逐渐变大， 他们的大脑变大的速度更快， 新大脑皮层同时变大的速度也更快， 发展出明显的隆起和褶皱 来增加它的表面积。