external canal auditory的用法和样例：
例句
- External auditory canal cholesteatoma is a rare disease entity.
摘要外耳道珍珠瘤为耳鼻喉临床少见病例。 - Myxoma of the external auditory canal is so rare that data on its occurrence is not collected in the pathologic atlas of ear tumors edited by the World Health Organization.
摘要发生与外耳道的黏液十分罕见，文献上均只见零星的报告，以至世界卫生组未将其列入所偏辑的耳科肿瘤病理图谱中。
