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1·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》

2·In this rudimentary natural society men go out to hunt and fish and to fight off the tribe next door while women keep the fire going.

在这个原始的自然社会里，男人出去打猎、捕鱼、击退隔壁部落，而女人则继续生火。

3·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》

4·Sleeping better may help fight off illness.

良好的睡眠可能有助于抵御疾病。

5·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。

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

然而，患有囊性纤维化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。

7·We use them to fight off the bad bacteria.

我们用它们抗击对我们有害的细菌。

8·Protein can help the body fight off a flu.

蛋白质可以帮助你的身体抵抗流感。

9·He asks them to use facts to fight off fear.

他要求他们用事实来打败恐惧。

10·BIG PIC: Glowing Snail Uses Light to Fight Off foes.

大图：发光的蜗牛利用光同敌人战斗。