河流与城市生态系统-系统论文发表 关键词：河流 城市生态系统 城市生态建设 [gap=4910]Key words[/b][/b]：river；urban ecological system； urban ecological construction
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The urban natural environment is an important part of urban ecological system.
城市的自然环境是城市生态系统中的重要组成部分。
Green space system is important part of urban ecological system, playing a decisive role in the improvement of urban ecological environment.
园林绿地系统是城市生态系统的重要组成部分，对于城市的生态环境有着决定性的改善作用。
Urban Greenland system is an important part of urban ecological system, and the ecological benefit of Greenland affects the quality of environment of whole city.
城市绿地系统是城市生态系统的重要组成部分，绿地生态效益直接影响到整个城市环境的质量。
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