We're going to write about river pollution.
我们打算写一写河流污染问题。
The reporter made a survey of river pollution.
记者对河流污染问题进行了调查。
To investigate the influence of river pollution on environment, especially formation of acid rain.
探讨河网严重污染后对环境的影响，尤其是对酸雨形成的影响。
River pollution, white pollution and so on are all around us.
河流污染、白色污染等等都包围着我们。
River pollution, white pollution and so on are all around us.
河水的污染，白色污染等，都存在于我们身边。
River pollution, white pollution and so on are all around us.
河水的污染，白色污染等，都存在于我们身边。
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