He brought his arm up in a futile attempt to ward off the blow.

他出于挡住这一击的无谓企图抬起了他的胳膊。

Many people swear by vitamin C's ability to ward off colds.

很多人深信维生素C能预防感冒。

She may have put up a fight to try to ward off her assailant.

她可能进行过一场搏斗，试图击退袭击者。

Some people think taking vitamin C can ward off colds.

有些人认为服用维生素C可以预防感冒。

Have a drop. It'll ward off the cold of the night.

喝一口挡挡夜里的寒气。