This is the 7988th most frequent Chinese word.
鼻腔
Nasal cavity.
Here, '鼻腔' refers to the anatomical nasal cavity, explaining its condition during illness.
当感冒时，鼻腔可能会充满黏液。
When having a cold, the nasal cavity may fill with mucus.
In this sentence, '鼻腔' is used in a medical context indicating the area targeted for the saline rinse.
医生建议每天使用盐水清洗鼻腔以减轻过敏症状。
The doctor recommended daily saline rinses of the nasal cavity to alleviate allergy symptoms.
This usage of '鼻腔' highlights its physiological function in breathing.