这些皱褶和沟回结构大大增加了新皮层的表面积，为数十亿的神经元提供了空间。

The folds increased the surface area available for the billions of neurons in the human neo-cortex.

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他或者她，已经消失在几十亿发怒的神经元中。

He or she has disappeared into a billion firing neurons.

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互联网把数十亿计算机联接在一起，其路径以万亿计。人类大脑也是把数十亿神经元联接在一起，其通路也是上万亿。

The Internet connects billions of computers in trillions of ways, just as a human brain connects billions of neurons in trillions of ways.

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