1·Who sets the standard for water quality?
水质标准由谁来制订？
—— 《牛津词典》
2·It can also help to purify the water quality, reduce pollution and improve environment.
荷花还可净化水质、减少污染、改善环境。
3·They keep our air clean, reduce noise pollution, improve water quality and provide food and building materials.
他们保持我们的空气清洁，减少噪音污染，改善水质，提供食品和建筑材料。
4·This unique creature is part of an imperiled community of aquatic organisms in the Gulf of Mexico, where poor water quality and habitat loss have weakened the ecosystem.
这种独特的生物是墨西哥湾水生生物中遭到威胁的物种之一，墨西哥湾恶劣的水质和栖息地的丧失减弱了生态系统。
5·The spill spread over 165 square miles and posed a serious threat to both sea life and water quality.
原油的蔓延扩散超过了165平方英里，对海洋生物和水质造成了严重威胁。