他们属于支持细胞，也叫脑白质，它们为其余10%的大脑细胞提供物质和养分支持。 而这10%的细胞是神经细胞，他们构成了大脑灰质，负责人的思维活动。
These are the support cells, the white matter, which provide physical and nutritional help for the other 10% of cells, the neurons, which make up the grey matter than does the thinking.
二次抛物线模型曾广泛应用于养分效应的研究，然而这种对称模型与多数情况不符。
The quadratic parabola model was once widely used to study the effects of nutrients. Such a symmetric model, however, does not accord with the practical situation in most cases.
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