1. The human brain contains several billion nerve cells, which are connected with one another by fine nerves.
人类的大脑含有几十亿个神经细胞，这些细胞由纤细的神经将彼此连接起来。
2. A group of specialized nerve cells or a localized mass of gray matter in the brain or spinal cord.
神经核一组专门的神经细胞或存在于大脑或脊髓中灰物质的局部块
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