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The order of the pollution for serious level to light level in the seven key river systems in 2001 is: Hai River,Liao River,Huai River,Huang River,Song Hua River,Yangtze River and Pearl River. 2001年，七大水系污染由重到轻的顺序依次是：海河、辽河、淮河、黄河、松花江、长江和珠江。
The order of the pollution for serious level to light level in the seven key river systems in 2001 is: Hai River, Liao River, Huai River, Huang River, Song Hua River, Yangtze River and Pearl River. 2001年度七大水系污染由重到轻的顺序依次是: 海河、辽河、淮河、黄河、松花江、长江和珠江。
Percentage of Water Quality Grades of the Seven Key River Systems in 2001 2001年度七大水系水质类别比例
Key River System 主要水系
What is Australia's biggest river system? 澳洲最大的河流系统是?
Key Words : Landscape Architecture, Wetland, River System, Revetment , Plants, Wild Animals, purified water. 关键词：风景园林、湿地；水系；驳岸；植物；野生动物；
Pollution prevention work started full swing in key river valleys and regions. 重点流域和区域污染防治工作全面展开。
An extensive area of land drained or irrigated by a river system. 流域由一个大河系排水或灌溉的广阔的土地区城
This river system has over 30 rivers. 这一河系共有30多条河流。
The key factors involved in the changes in the Sihe river system are the invasion of the Yellow River and the opening of the Grand Canal. 泗河水系河道变迁的主要因素是黄河夺泗和南北大运河的开发。
The region draining into a river,river system,or other body of water. 流域将水排入某河流、水系或其它水体的地域。
The region draining into a river, river system, or other body of water. 流域:将水排入某河流、水系或其它水体的地域。
Pollution prevention and treatment should be intensified in key river valleys and key land and sea areas. 加强重点流域、区域、海域污染防治和城市环境综合整治。
Discharge of Domestic Pollutants by Key City Key River Basins and Offshore Marine Areas. 重点城市生活污染物排放情况重点流域及近岸海域统计。
Efforts were concentrated on controlling pollution in key river valleys,regions,sea areas and cities. 集中力量对重点流域、区域、海域、城市的污染进行治理。
Periodical results have been achieved in the pollution-control work of key river valleys, key regions and key cities. 重点流域、重点区域和重点城市污染防治工作取得阶段性成果。
The major pollution indicators in the Yangtze River system are petroleum and ammonia nitrogen. 长江水系的主要污染指标是石油类、氨氮和高锰酸盐指数。与上年相比，水质持平。
Efforts were concentrated on controlling pollution in key river valleys, regions, sea areas and cities. 集中力量对重点流域、区域、海域、城市的污染进行治理。
National standards would have stricter limits for discharge of pollutants in key river valleys. 提高重点流域水污染物的国家排放标准。
The water quality of the Pearl River system in Guangxi is better than that in Guangdong. 珠江水系广西境内江段水质好于广东境内江段。