Eustachian tube

名词 eustachian tube:

1. either of the paired tubes connecting the middle ears to the nasopharynx; equalizes air pressure on the two sides of the eardrum
   同义词：auditory tube

1. The child has earache caused by blocked Eustachian tubes.
   这孩子因耳咽管堵塞而引起耳痛。