River basin is a complex environmental system.
流域是一个复杂的环境系统。
The concept, evolution, reservoir forming mechanism and mode of the basin-centered gas system are described.
为此，对盆地中心气系统的概念、该系统的形成演化、成藏机理与成藏模式进行了阐述；
Quantity"and "quality"are two basic features of large system of a river basin.
“水量”与“水质”是流域大系统的两个基本特征。
Quantity"and "quality"are two basic features of large system of a river basin.
“水量”与“水质”是流域大系统的两个基本特征。
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