1
the epithelium of [organ/part]
表示某个器官或部位的上皮时，常用 the epithelium of ... 结构。
The epithelium of the small intestine has villi that increase the surface area.
小肠的上皮有绒毛，可增加表面积。
上皮；上皮组织
先理解核心含义，再看它在真实句子里的用法。
上皮；上皮组织
membranous tissue that covers internal organs and other internal surfaces of the body
The epithelium of the small intestine has villi that increase the surface area.
小肠的上皮有绒毛，可增加表面积。
医学术语
由一层或多层细胞构成的膜状组织,覆盖身体及器官的大部分内外表面:内部衬于血管和其他小腔,外部即为皮肤。
A membranous tissue composed of one or more layers of cells which forms the covering of most internal and external surfaces of the body and its organs: internally including the lining of vessels and other small cavities, and externally being the skin.
The epithelium lines the inner surface of the stomach.
上皮组织覆盖在胃的内表面。
We studied the cells of the epithelium under a microscope.
我们在显微镜下研究了上皮组织的细胞。
Healthy epithelium forms a protective barrier for the body.
健康的上皮组织为身体形成一道保护屏障。
表示某个器官或部位的上皮时，常用 the epithelium of ... 结构。
The epithelium of the small intestine has villi that increase the surface area.
小肠的上皮有绒毛，可增加表面积。
covering ... 是现在分词短语作后置定语，相当于 which covers ...。
The epithelium covering the trachea contains goblet cells.
覆盖气管的上皮含有杯状细胞。
cover 表示上皮覆盖在器官表面；注意复数形式 epithelia 也常见于学术文本。
A thin epithelium covers the alveoli of the lungs.
一层薄薄的上皮覆盖着肺的肺泡。
Not this
The epithelium cells are damaged.
Use this
The epithelial cells are damaged.
中文里说“上皮细胞”时用“上皮”修饰“细胞”，但英语中名词不能直接作定语，应使用形容词形式“epithelial”（上皮的），所以改为“epithelial cells”。
Not this
Epithelium are a type of tissue that covers organs.
Use this
Epithelium is a type of tissue that covers organs.
这里“epithelium”是单数名词，表示“上皮组织”这一整体概念，谓语动词应用单数“is”。“are”是误把它当作复数名词，注意主谓一致。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
柱状上皮
The intestinal lining is made of columnar epithelium.
肠道内壁由柱状上皮组成。
鳞状上皮
The esophagus is lined with squamous epithelium.
食管内衬鳞状上皮。
表面上皮
The surface epithelium protects the underlying tissue.
表面上皮保护其下的组织。
呼吸道上皮
The respiratory epithelium lines the airways.
呼吸道上皮覆盖气道。
嗅上皮
The olfactory epithelium is located in the nasal cavity.
嗅上皮位于鼻腔内。
Use epithelium naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象 epi 里藏着 pi（皮），e 是外表面，上皮就是覆盖在表面的一层皮。
语域：formal 常见场景：医学文献、生物学课堂 epithelium 通常用于医学或生物学的正式语境，如学术论文、教材或临床讨论；在日常口语中很少使用。
复数形式为 epitheliums（也作 epithelia）。
Dictionary facts from ECDICT, WIKTIONARY.