myelin sheath

例句：

1. 1. Myelin sheaths protect the axons in my brain.
   髓鞘保护我大脑中的轴突。
2. 2. Themyelin sheathis essential for nerve conduction.
   髓鞘对于神经传导至关重要。
3. 3. Themyelin sheath helps to preventelectrical impulses from spreading too quickly.
   髓鞘有助于防止电信号传播过快。