多带点钱保险些，以防急用。

It would be safer to take more money with you in case of emergency.

《牛津词典》

犬类必须接种疫苗以防犬热病。

Dogs must be vaccinated against distemper.

《柯林斯英汉双解大词典》

肉排应以中温烹制以防过分烧焦。

The chops should be cooked over moderate heat to prevent excessive charring.

《柯林斯英汉双解大词典》

But again, that we will supply for you on the exam just in case you forget it at that moment.

但在考试中我们会给出这个值,以防你当时忘记了。

麻省理工公开课 - 化学原理课程节选

In order to keep the currency convertible they had to keep interest rates high to prevent people from demanding the gold.

为了保持货币的转换性,他们不得不将利率提高,以防人们向他们索求金子的兑换。

耶鲁公开课 - 金融市场课程节选

There would be some sort of cooking, some attempt to store food for when people may have been hungry later, etc.

食物会被烹制,有人试着储藏食物,以防饥饿

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选