epithelial lining的用法和样例：
例句
- Many of the epithelial cells at the interface with the outside world are mucosal epithelial cells which secrete mucus.
很多位于与外接相通的接触面上的上皮细胞是粘膜上皮细胞，它们能分泌粘液。 - The vast majority of lung cancer originated in bronchial epithelium, but there are a few cancer in alveolar epithelial origin or bronchial glands.
绝大多数肺癌起源于支气管粘膜上皮，但亦有少数癌肿起源于肺泡上皮或支气管腺体。
