大脑的运行方式亦是如此，用不到的神经键，大脑就开始将其修剪掉，为的是让剩下的神经键更有效率地进行联络。
The brain works the same way, because it starts pruning away the synapses that it doesn't need in order to make the remaining ones much more efficient in communicating.
神经元组形成庞大的网络，通过改变细胞之间神经键的强度，达到处理信息和学习的目的。
Groups of neurons form vastly interconnected networks, which, by changing the strength of the synapses between cells, can process information, and learn.
随着年龄不断增长，有害化学物质会损害我们的神经元和神经键，导致记忆衰退甚至老年痴呆症。
As we get older, toxic chemicals will damage our neurons and synapses, leading to memory loss and even Alzheimer's.
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