名词
中文翻译：耳膜后部
同义词：
['posterior membranous recess', 'posterior tympanic membrane recess']
例句：
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1. The patient's eardrum was found to have a posterior membranous recess.
患者的鼓膜被发现有一个后部膜状凹陷。
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2.The doctor advised the patient to remove the posterior tympanic membrane recess with an instrument.
医生建议患者用一种器械去除后部鼓膜凹陷。
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3. The posterior membranous recess of the ear canal is often filled with wax.
耳道的后部膜状凹陷通常被蜡填充。