Lisa要去旅行
Air pollution is a serious situation。（空气污染） （是） （很严峻的形势）即指空气污染很严重。当然，如果你要直译的话：则可 Air pollution is very serious。希望能帮到你。
北京吃贷123
那些美丽的花已经严重被污染了Those beautiful flowers have been seriously polluted.那些美丽的花已经严重被污染了Those beautiful flowers have been seriously polluted.
wangqinglin0
我家门前的小河受到很严重的污染。
用英语表达是：
1) The small river in front of my house is very polluted.
2) The river in front of my house is seriously polluted.
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