1.The human immunodeficiency virus -- HIV attacks and destroys CD4 cells making patients unable to fight off infection.
fight off 擊退;排斥;竭力避免
He fought off three men who attacked him.
他擊退了三個向他襲擊的人 。
Did your husband manage to fight off his cold by taking aspirin?
你丈夫服用阿司匹林治好感冒了嗎?
He's been fighting Nina off for years but she'll catch him in the end.
多年來他一直在躲避尼娜,可最終她總會撞見他的 。