科学家们发现，海马体的大脑灰质密度增加了，海马体是大脑中负责学习和记忆的区域。

Scientists found increases in gray-matter density in the hippocampus—an area responsible for learning and memory.

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在这些运动员大脑中观察到的相对小的灰质面积和密度所代表的意义尚不清楚，研究者们说。

The significance of the relatively smaller gray matter volume and density seen in these players is not yet clear, the researchers say.

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有些好处甚至是看得见的，比如，多语者大脑灰质的密度更高，而灰质中包含了大脑中多数的神经元和突触。另外，在使用第二语言时，大脑的特定区域也会更加活跃。

Some of these are even visible, such as higher density of the grey matter that contains most of your brain's neurons and synapses, and more activity in certain regions when engaging a second language.

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有些好处甚至是看得见的，比如，多语者大脑灰质的密度更高，而灰质中包含了大脑中多数的神经元和突触。另外，在使用第二语言时，大脑的特定区域也会更加活跃。

Some of these are even visible, such as higher density of the grey matter that contains most of your brain's neurons and synapses, and more activity in certain regions when engaging a second language.

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