严防的英文：
take strict precautions against

参考例句：

We should keep a sharp look - out for their disruptive activities.
我们要严防他们的破坏活动。

In scientific discussions it is essential to guard against subjectivism and arbitrariness.
在科学讨论中要严防主观武断。

The desiccator tells you: Photographic apparatus should be kept dry.
干燥剂告诉你:摄影器材，严防受潮。

take是什么意思：
v. 拿，取；带；获得；采取；承担；吃；耗费；乘，搭；以为；理解；走；抓住

a catch; a take; a taking
捕获量

take a nap; take a snooze
小睡一下;睡午觉

take service with
在￥帮佣

strict是什么意思：
adj. 严格的；严厉的；严谨的；精确的；完全的；周密的

follow a strict diet
严格遵照饮食规定

She is strict in the matter of discipline.
她对纪律的要求是严格的。

There are strict controls on immigration into this country.
移民到这个国家有严格的限制。

precautions是什么意思：
n.[C]
1.预防措施或方法

I took an umbrella as a precaution.
我带了一把伞以防下雨。

All this woke the local government to the need for safety precautions.
所有这些使当地政府认识到必须采取安全预防措施。

We have taken necessary precautions against fire.
我们已采取必要的防火措施。