residual voltage-current character-istic

例句：

1. 1. The residual heat from the fire still lingers in the air.
   火后留下的余热仍在空气中。
2. 2. The residue of the chemical reaction can be analyzed to determine its properties.
   化学反应的残留物可以分析以确定其性质。
3. 3. The residue of the experiment was a valuable lesson for future research.
   实验的残余物为未来的研究提供了宝贵的教训。