Declining mental function is often seen as a problem of old age, but certain aspects of brain function actually begin their decline in young adulthood, a new study suggests.

心智功能衰退通常被视为老年问题，但一项新的研究表明，大脑功能的某些方面实际上在青年时代就开始衰退了。

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While aging is inevitable, scientists are finding out that certain changes in brain function may not be.

尽管衰老是不可避免的，科学家们却发现大脑功能的某些变化或许并非不可避免。

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This namespace declaration is required for any application that USES the library since the user-defined function has to be in a certain namespace.

任何使用该库的应用程序都需要这个名称空间声明，因为用户定义的函数必须存在某个名称空间中。

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Only cells in your brain make the enzymes that produce certain neuron transmitters that are responsible for brain function.

只有脑细胞产生,促进神经传导的相关酶,由此维持大脑功能

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