epithelial cell

例句：

1. 1. The epithelial cells lining the inside of the lungs are responsible for filtering out harmful substances.
   肺部内衬的上皮细胞负责过滤掉有害物质。
2. 2. The doctor examined the patient's epithelial cells and found no signs of infection.
   医生检查了患者的上皮细胞，没有发现感染的迹象。
3. 3.The study focused on the role of epithelial cells in wound healing.
   该研究关注了上皮细胞在伤口愈合中的作用。