| 释义 |
Eustachian tube
UK [ju:ˌsteɪ.ʃən'tju:b] US [-'tu:b] noun countable specialized
■either of the two passages between the middle ear and the back of the nose which open to allow pressure to be kept equal on both sides of the eardrum 耳咽管；咽鼓管（连通中耳和鼻咽部的管道，共两条，开通时耳鼓内空气和大气相通，平衡耳鼓内气压和大气压之间的压差） |