我们在进行北河小流域系统分析时，将众多的因素聚类组合，建立了层次分析模型。
When analysing Beihe small watershed systematically we cluster and group all the factors and establish models of level analysis.
我们在进行北河小流域系统分析时，将众多的因素聚类组合，建立了层次分析模型。
When analysing Beihe small watershed systematically we cluster and group all the factors and establish models of level analysis.
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