He felt pleasantly drowsy and had to fight off the urge to sleep.

他感觉舒适地昏昏欲睡，不得不击退睡意。

《柯林斯英汉双解大词典》

Unfortunately these drugs are quite toxic and hinder the body's ability to fight off infection.

不幸的是，这些药毒性很大，妨碍身体抗感染的能力。

《柯林斯英汉双解大词典》

People with cystic fibroses are unable to fight off such bacteria, even though their lungs produce normal amounts of the antibiotic.

患有囊性纤维变性的人却无法抵抗这种细菌，即使他们的肺部能产生正常数量的抗生素。

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So,they lack the immunity to fight off the disease.

VOA: standard.2009.09.04

He is against singling out a particular citizen or group of people to go off and fight.

他反对特定挑选某个公民,或某个群体去参加战斗。

耶鲁公开课 - 公正课程节选

Well, he has a wife whom he loves, Penelope, and he has a son whom he has barely seen because he had to go off to Troy almost 20 years ago to fight that battle and he hasn't been home since.

因为他有挚爱的妻子珀涅罗珀,以及一个由于二十年前,他前赴参加特洛伊战争,而几乎素未谋面的儿子

耶鲁公开课 - 古希腊历史简介课程节选

It is a vital part of the immune system and helps to fight off infections.

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Atchison, Hefner and Rice all started with crossword puzzles mostly just to fight off boredom.

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The strong broad spectrum antibiotics needed to fight off such infections are also astronomical in price.

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