人的大脑平均有100亿个神经元，或者叫做神经细胞。每个神经元与其它一千至一万个神经元相连。
The human brain contains an average of ten billion neurons or nerve cells, each of which is linked with one thousand to ten thousand other neurons.
老鼠的大脑中每天会生成数千个新的脑细胞或神经元，且据此推测，人的大脑亦复如是。
Thousands of new brain cells or neurons grow each day in the brains of rats and, presumably, in the brains of people, too.
发表在同行审阅杂志上的最新调查结果说，人来中叫做Sirtuin1的同样的酶能增强记忆也能提高神经元细胞的发育。
Called Sirtuin1 in humans, that same enzyme seems to enhance memory and nerve-cell development in the brain as well, according to the new findings, published in the peer-reviewed journal Nature.
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