柯林斯詞典chronic fatigue syndrome 1. N-UNCOUNT Chronic fatigue syndrome is an illness that is thought to be caused by a virus, and which affects people for a long period of time. Its symptoms include tiredness and aching muscles. The abbreviation is often used. 慢性疲勞綜合癥; 縮寫為CFS 返回 chronic fatigue syndrome劍橋詞典an illness , sometimes lasting for several years , in which a person's muscles and joints (= places where two bones are connected ) hurt and they are generally very tired 慢性疲勞綜合征 返回 chronic fatigue syndrome