严重污染的英文：
severe contamination

参考例句：

There has been serious pollution since industrialization.
自从工业化以来就有了严重的污染。

Serious pollutions in modem cities give some cause for concern.
现代城市中的严重污染令人担忧。

Setting off firecrackers makes a tremendous noise and causes serious air pollution.
燃放鞭炮会产生巨大的噪声，严重污染大气。

During irrigation period, the backflow from the farmland pollutes the branch.
每当农业灌溉之时，支流都因倒流而严重污染。

severe是什么意思：
adj. 严重的；严厉的；严格的；严峻的；严肃的，纯洁的

Rape several women or have sexual relations with several girls
强奸妇女、奸淫幼女多人的

This assumption is false in several ways.
这种推断是错误的，错在了多个方面。

It comes with several inbuilt features.
他有很多固定的特征。

The storm caused severe drifting.
暴风雪造成了严重的积雪现象。

The engine misfired several times.
发动机好几次发动不起来。

contamination是什么意思：
n. 弄脏，污染；杂质；放射性污染；混淆；感染错合

contamination activity
污染放射性

To contaminate;taint.
损坏；玷污

To taint;contaminate.
使有缺点；玷污

particulate contaminant
粒状污染物

trace contaminant
残余污染物