他的病是慢性的，需要长期治疗。
tāde bìng shì mànxìng de ， xūyào chángqī zhìliáo 。
His illness is chronic and requires long-term treatment.
这种药物的效果是慢性的，不会立刻见效。
zhèzhǒng yàowù de xiàoguǒ shì mànxìng de ， búhuì lìkè jiànxiào 。
The effect of this medication is slow and won't show results immediately.
慢性疲劳综合症使他每天都感到疲倦。
mànxìng píláo zōnghé zhèng shǐ tā měitiān dū gǎndào píjuàn 。
Chronic fatigue syndrome makes him feel tired every day.