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Sigma KEE - RiverSystem
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河流系统
A RiverSystem comprises all the tributary streams and rivers (StreamWaterAreas) that drain along converging paths into the main river of the system, which discharges into a StaticWaterArea.
Relationships      
Parents 群体 Collections have members like Classes, but, unlike Classes, they have a position in space-time and members can be added and subtracted without thereby changing the identity of the Collection. Some examples are toolkits, repeated actions, football teams, and flocks of sheep.
  水域 A body which is made up predominantly of water, e.g. rivers, lakes, oceans, etc.


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