您要查找的是不是：
- Is the water polluted at source or further downstream? 河水是在源头还是在流出之後受到污染的？
- How is the water polluted? Let's find the reason. 蝴蝶:水怎么会被污染呢?我们去找找原因吧。
- Is the water polluted at source? 河水是在源头受到污染的吗?
- Water pollution imperils all kinds of marine life. 水质污染危及所有海洋生物。
- Was water pollution a problem before? 以前有水污染问题吗?
- Eg: They did a lot to stop water pollution. 他们采取大量措施制止水污染。
- Fight the mounting threat of urban water pollution. 应对日益严重的城市水污染的威胁。
- Water pollution did damage to the crops. 水污染对农作物造成损害。
- Industrial water Pollution Control II. 工业水污染控制2。
- BOD 5 is the synthetical evaluation index of water polluted by organic location. 五日生化需氧量 (BOD5)是评价水体受有机物污染的相对耗氧指标。
- How are frogs being harmed by water pollution? 水污染是如何对青蛙造成损害的?
- Design a poster for preventing water pollution. 设计一幅防止水污染的海报。
- The concern of this book is water pollution. 这本书所讲的是水污染问题。
- Officials say the current outbreak might have been caused by water polluted with waste from cattle. 相关官员指出现在的疫情可能由被牛的排泄物污染的水引起的。
- Dioxane has been frequently detected in river water, especially in ground water polluted by volatile halogenated hydrocarbons. 二恶烷经常会在河水、特别是地下水中被检测到，这主要是由于挥发性的卤代碳氢化合物造成的污染。
- The water splash volume can always be kept within 0.1% by recycles designing, the gullet has cover to prevent the cycle water polluted. 采用带收水器的淋水填料，将漂水损失控制在千分之一以下；布水槽带盖板，防止循环水受到污染；
- There are 700 million people drink the extra colibacillus water, about 170 million people drink the water polluted by organism. 全国有7亿人口饮用大肠杆菌超标水，约1.;7亿人饮用被有机体污染的水。
- In the waste water polluted by EDTA and heavy metals, it is difficult to determination of its content by simple method because of complex formed. 在被EDTA和重金属离子污染的废水中,由于它们之间的络合作用,很难用简单的方法测出二者的含量。
- Water pollution has also increased with urban development. 随着城市发展，水污染问题日益严重。
- Soil erosion is a main contributor to water pollution. 土壤侵蚀是水污染的一个主要根源。
