图左示正常宫颈鳞状上皮，图右示其不典型增生的改变，因防御功能下降，粘膜下层有慢性炎症。
The normal cervical squamous epithelium at the left transforms to dysplastic changes on the right. There is also underlying chronic inflammation because abnormal epithelial surfaces do not provide the same protective barrier as normal epithelial surfaces do.