Water pollution is getting more and more serious now. Hundreds of dead fish can be seen on the surface of the water because of water pollution.
水污染现在越来越严重。由于水污染，数以百计的死鱼可以在河面上看到。

We can't live without water, but now many rivers are polluted. And it's very dangerous for us to drink such water.
没有水我们不能生存，但是现在许多河流被污染了。我们喝这样的水是非常危险的。

Our government is taking measures to protect the river against pollution. I hope we'll have a clean and beautiful river in the future.
我们的政府正在采取措施保护河水不受污染，我希望我们的未来会有干净美丽的河流。

词义解析：

1.pollution：污染（名词）
2.serious：严重的
3.surface：表面
4.pollute：污染（动词）
5.dangerous：危险的
6.government：政府
7.measure：方法
8.protect：保护