More research is needed to develop effective methods of removing volatile chemicals from waste streams without contributing to the problem of air pollution . 要注意多研究从废水中除去挥发性化学物质而又不引起空气污染的有效方法。
Emphasis on pollution abatement may cause recovery systems to be installed, especially if production cost can be brought near the break-even point . 消除污染的强烈要求可能促使建立各种回收系统，要是生产费用接近不赚不负的话更是如此。
An overloaded poorly maintained gasoline-or diesel-powered vehicle pouring out black smoke is an extreme illustration of visual air pollution . 以汽油或柴油为动力，维护得很差的，并排放黑烟的超载交通工具是可以看到的空气污染的最明显的例证。
We must make the polluted river clear again 我们必须使受到污染的河流变得干净。
Sources of meat contamination and the counter measures 肉品污染的来源及应对措施
Bioremediation technology of polluted soil by selenium 土壤硒污染的生物修复技术
It was once a beautiful city free from pollution 过去这是一个漂亮无污染的城市。
Clothing for protection against radioactive contamination 防放射性污染的防护衣
It was once a beautiful city free from pollution 过去这是一个美丽无污染的城市。
