名词
中文翻译：膜内层
同义词：
['innermost layer', 'innermost membrane', 'innermost layer of tissue']
例句：
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1. The epithelial cells are responsible for the maintenance of the skin's barrier function.
上皮细胞负责维护皮肤的屏障功能。
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2.The epithelial lining is essential for proper digestion and absorption of nutrients.
上皮层对于正常的消化和营养物质吸收至关重要。
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3. The epithelial layer is where cells line the surface of organs and tissues.
上皮层是器官和组织表面的细胞层。