neuron

例句：

1. 1.Neurons are the basic building blocks of the nervous system.
   神经元是神经系统的基本构建单元。
2. 2.The brain contains billions of neurons, each with its own unique function.
   大脑包含数十亿个神经元，每个都具有其独特的功能。
3. 3. Researchers have been trying to understand how neurons communicate with each other.
   研究人员一直在尝试理解神经元是如何相互交流的。