non-myelinated nerve fiber

例句：

1. 1. The patient's condition worsened after the surgery.
   手术后，患者的病情恶化了。
2. 2.The scientist used this technique to study the structure of non-myelinated nerve fibers.
   这位科学家使用这种方法研究了非髓鞘神经纤维的结构。
3. 3.The researcher found that non-myelinated nerve fibers are more sensitive to temperature changes than myelinated ones.
   研究者发现，非髓鞘神经纤维对温度变化比髓鞘神经纤维更敏感。