The water quality evolvement process in Yangtze River drainage area is believed as a complex network system, with having lots of nodes and correlating to the downflow.
长江流域水质演变过程可看成是一个具有多节点，向下流关联的复杂网络系统。
This paper presents the hydrologic network design and hydrometry method in the Pearl River Delta, which is very complex in drainage network.
水系复杂的珠江三角洲河网地区具有独特的水文站网布设及水文测验方法。
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