residue of a function at a pole

例句：

1. 1. Thechemical residue on the surface of the samplewas analyzed using a mass spectrometer.
   使用质谱仪分析了样品表面的化学残留物。
2. 2. The leftovers from the dinnerwere left in the fridge for the nextday's lunch.
   晚餐的剩菜被留在冰箱里，准备第二天的午餐。
3. 3. The scientist found that the residue ofthe experiment had led to some unexpected results.
   科学家发现实验的残留物导致了一些意想不到的结果。