The first type of epithelium is called keratinized stratified squamous epithelium.

第一种上皮名叫角化复层鳞状上皮。

Squamous cell carcinoma arises from the stratified squamous epithelium.

食管鳞癌起源于复层鳞状上皮。

Most of the oral cavity is lined by stratified squamous epithelium, so the majority of cancers that arise are squamous cell cancers.

口腔内大部分表面都由复层鳞状上皮覆盖，所以大部分口腔癌都属于鳞状细胞癌。

A second type of epithelium is non-keratinized stratified squamous epithelium, and it contains cells that don't produce much keratin, making this layer less tough.

第二种上皮是未角化的复层鳞状上皮，其细胞产生的角质较少，故这层结构相对比较脆弱。

All right, as a quick recap, oral cancer refers to cancers that originate in the oral cavity, which is lined by keratinized or non-keratinized stratified squamous epithelia.

得！快速回顾一下：口腔癌指起源于口腔的癌症；口腔由角化或未角化的复层鳞状上皮覆盖。

So its mucosa is made up of stratified squamous epithelium, which is better equipped to resist abrasion from food going down.

因此，其粘膜是由复层鳞状上皮构成的，能较好地抵御食物对食管的磨损。

The oral surfaces covered by non-keratinized stratified squamous epithelium include the buccal mucosa, the floor of the mouth, the lateral and ventral (or bottom) surfaces of the tongue, the soft palate, and the retromolar trigone.

口腔表面由未角化的复层鳞状上皮覆盖的结构，包括颊黏膜、口底、舌的侧面和腹侧（或底面）、软腭与磨牙后三角。

The mucosa also has three layers of its own: a layer made of stratified squamous epithelium; a layer of connective tissue, called the lamina propria; and a layer of muscle cells, called the muscularis mucosae.

黏膜层本身又由三层结构组成，一层复层鳞状上皮，一层结缔组织，又叫固有层，还有一层肌细胞，又叫黏膜肌层。

Every gustatory cell projects a thread-like protrusion of the cellular membrane called a gustatory hair, which runs down to a taste pore, a small hole in the stratified squamous epithelium covering the taste bud and the rest of the tongue.

每个味觉细胞在细胞膜上投射出一个叫做味觉毛的线状突起，向下延伸到味觉孔，味觉孔是覆盖味蕾和舌头其余部分的分层鳞状上皮上的一个小洞。