illness

詞意辨析：

illness, sickness, disease, complaint

這些名詞均有“疾病”之意。
illness: 不具體指，而是泛指一切疾病，強調生病的時間或狀態，語體較sickness正式一些。
sickness: 較口語化，可與illness換用，但還可表示“噁心”。
disease: 指具體的疾病，且通常較嚴重，發病時間也較長。
complaint: 現代英文中，既可指症狀，也可指疾病。

英文解釋：

名詞 illness:

1. impairment of normal physiological function affecting part or all of an organism
   同義詞：unwellness, malady, sickness

相關句子：

1. He will pull through his illness soon.
   他很快就會恢復健康的。
2. Worry and illness had made him prematurely old.
   他心事重重、 疾病纏身，落得個未老先衰。
3. He came to the meeting despite his illness.
   儘管生病，他還是來參加會議。
4. Too much work and too little rest often lead to illness.
   過量的工作和過少的休息會引起疾病。
5. Her long illness gradually sapped her strength.
   長期的患病使她的體力漸漸衰竭。
6. His illness diminished his health.
   疾病侵蝕了他的健康。
7. There was no illness in the village this winter.
   今年冬天這村里沒什麼疾病。