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。

The oral surfaces covered in keratinized epithelium include the hard palate, the dorsal surface, or top, of the tongue, and the gingiva.

口腔表面由角化上皮覆盖的结构包括硬腭、舌的背侧面（或上面）与牙龈。

This leathery armor protects their skin while they hunt, and any captured prey that tries to escape is impaled on the keratinized spikes lining the leatherback's esophagus.

这种坚韧的盔甲在它们捕猎时保护它们的皮肤，任何试图逃跑的猎物都会被棱皮龟食道里的角化尖刺刺穿。

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。