illness是可數名詞嗎

illness是名詞 但是不可數 1.患病(狀態);身體不適[U]During his illness, John stayed indoors. 約翰在生病期間足不出戶。2.(某種)疾病[C]I have never seen her since her father fell sick of a serious illness. 自從她父親生重病後,我就再也沒有見過她。