illness既是可數(shù)名詞，又是不可數(shù)名詞。意為患病、身體不適時(shí)，是不可數(shù)的；意為某種疾病時(shí)，是可數(shù)的。Illness的讀音為：英/??ln?s/、美/??ln?s/。

1.患病(狀態(tài))、身體不適[U]，此時(shí)不可數(shù)，例：During his illness,John stayed indoors.約翰在生病期間足不出戶。

2.(某種)疾病[C]，此時(shí)可數(shù)。例：I have never seen her since her father fell sick of a illness.