Part of the complexity of the nervous system is the complexity of this interconnection of cells.

神经系统的复杂性部分地,体现在神经细胞间相互连接的复杂性

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The reason for that complexity is because your immune system needs to be able to respond to all the potential foreign invaders that we could encounter.

整个系统之所以如此复杂是因为,免疫系统需要应对所有,我们要面对的来犯之敌

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That's what leads to some of the complexity of function of the nervous system.

这就是导致,神经系统功能多样性的原因

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