yī shēng / jiě shì / shuō / ěr yàn guǎn / lián jiē / zhōng ěr / hé / bí yān bù / fù zé / tiáo jié / liǎng cè / de / qì yā

医生解释说，耳咽管连接中耳和鼻咽部，负责调节两侧的气压。

The doctor explained that the Eustachian tube connects the middle ear to the nasopharynx and regulates the air pressure on both sides.