常見(jiàn)例句雙語(yǔ)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，粘膜上皮細(xì)胞向下凹陷形成小的絨毛，但無(wú)隱窩形成，細(xì)胞呈幼稚形態(tài)。 返回 fovea inferior