常见例句双语例句Immature epithelial cells in mucous membrane began to be inferior fovea , to form micro-villi when epithelial cells were immature at E17 day.胚胎第17天，粘膜上皮细胞向下凹陷形成小的绒毛，但无隐窝形成，细胞呈幼稚形态。 返回 fovea inferior