Now the mucosal tissue in the oral cavity can undergo several premalignant pathological changes.

口腔内黏膜组织可经历数种癌前病理变化。

The oral cavity and oropharynx are lined by epithelium - and there are a few different types.

口腔和口咽被覆盖，有几种不同类型。

The oral microbiota plays an important role in maintaining oral homeostasis protecting the oral cavity and preventing disease.

口腔微生物群在维持口腔内环境平衡、保护口腔以及预防疾病等方面，发挥着重要作用。

These microbes play an important role in maintaining oral homeostasis, protecting the oral cavity, and preventing disease development.

这些微生物在维持口腔内动态平衡、保护口腔与预防疾病等方面起到了重要作用。

The pizza goes in our oral cavity where we use our teeth to masticate, or chew the food up into small fragments.

披萨进入口腔后，我们用牙齿咀嚼食物，将食物嚼成小块。

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

口腔内部分表面都由复层鳞状覆盖，所以部分口腔癌都于鳞状细胞癌。

The major genera with the largest representation in the oral cavities include: streptococcus, prevotella, haemophilus, rothia, veillonella, neisseria, fusobacterium, and porphyromonas.

口腔中微生物主要包括以下几：链球菌、普氏菌、嗜血杆菌、罗氏菌、韦荣氏球菌、奈瑟氏菌、梭杆菌与卟啉单胞菌。

Many carcinogens come into contact with a wide area within the oral cavity and oropharynx, so the idea is that they cause field cancerization.

许多致癌物可以广泛接触到口腔和口咽内，故有一猜想就是这些物质引发区域癌化。

The lips form the opening to the mouth, while the cheeks or bucca (buccae) form the borders of the oral cavity.

嘴唇形成口开口，而脸颊或颊形成口腔边界。

The structures within the oral cavity including the teeth, tongue, and palate, are involved in the chewing (mastication) and swallowing (deglutition) of food.

口腔内结构包括牙齿，舌头和腭，它们对食物咀嚼（粉碎）和吞咽（咽下）起作用。

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癌症；口腔由角化或未角化复层鳞状覆盖。

The oral cavity. The process of digestion begins in the mouth, also called the buccal cavity, which is the opening through which food enters the body.

口腔。消化过程是从口开始，也可以说是从口腔开始，口腔是食物进入体内开口。

While the prognosis of squamous cell carcinoma in the oral cavity depends largely on the tumor stage, HPV status is a main prognostic factor for squamous cell carcinoma in the oropharynx.

口腔鳞状细胞癌预后，很程度取决于肿瘤分期，而感染HPV状况则是口咽部鳞状细胞癌一主要预后因素。

Alcohol is known to be a direct cause of seven different cancers: head and neck cancers (oral cavity, pharynx and larynx), esophageal cancer, liver cancer, breast cancer and colorectal cancer.

已知酒精是七种不同癌症直接原因：头颈癌（口腔癌、咽癌和喉癌）、食道癌、肝癌、乳腺癌和结直肠癌。

This alteration can disrupt the bacterial equilibrium in the oral cavity by increasing harmful bacteria and decreasing the beneficial ones, thus leading to a series of oral infectious diseases such as dental caries, or periodontal diseases.

这种改变会增加有害菌、减少有益菌，从而破坏口腔中细菌平衡，导致龋齿、牙周疾病等一系列口腔感染性疾病发生。

Oropharyngeal cancers are strongly associated with infection by human papillomavirus type 16, but interestingly, tumors of the oral cavity, like the lateral tongue and floor of the mouth are not usually associated with HPV 16.

口咽癌与人乳头瘤病毒（HPV）16型感染密切相关，但有趣是，在口腔肿瘤中，像是舌两侧和口底肿瘤则一般与HPV 16没有联系。

Alright, as a quick recap, the human oral microbiota is represented by the community of microorganisms which are normally found in the oral cavity and can exist as free-floating bacteria, or in the form of a biofilm.

得！快速回顾一下～人类口腔微生物群以口腔内常见微生物群为代表；这些微生物群可以是游离细菌，也可以以生物膜形式存在。