♦ SOURCE stratified squamous epithelium stratified squamous epithelium 英語版 英語版 stratified squamous epithelium stratified squamous epithelium stratified squamous epithelium 英語版 stratified squamous epithelium 英語版 squamous epithelial cells Stratified squamous epithelium Stratified squamous epithelium 英語版 squamous epithelial cells stratified squamous epithelium stratified squamous epithelium squamous epithelial cells stratified squamous epithelium stratified squamous epithelium multiple layers of flattened cells 英語版 英語版 Stratified squamous epithelium