necine

例句：

1. 1. Neurons are the basic units of the nervous system.
   神经元是神经系统的基本单位。
2. 2. The brain is made up of billions of neurons.
   大脑由数十亿个神经元组成。
3. 3. Neurons communicate with each other through electrical signals.
   神经元通过电信号相互交流。