an abnormal passage leading from a suppurating cavity to the body surface
any of various air-filled cavities especially in the bones of the skull
a wide channel containing blood; does not have the coating of an ordinary blood vessel
造句
用作名詞(n.)
If you cannot equalize pressure in the middle ear cavities or sinuses, you should not continue to descend. 如果你不能平衡耳腔和鼻竇內的壓力，你必須停止下潛。
Sinonasal undifferentiated carcinoma is an uncommon aggressive malignancy of the nasal cavity and the paranasal sinuses. 摘要鼻腔鼻竇未分化細胞癌是一種罕見且侵犯性很高的鼻腔及鼻竇惡性腫瘤。