How to choose a optimum cooperative partner scheme to form the virtual logistic enterprise from the numerous logistic enterprises, that is a problem worth studying.

如何从众多的潜在企业中选择一个最优的合作伙伴构成方案，是一个值得研究的问题。

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The question arises when a developer is trying to add a hierarchical level to an XML document. I think it's worth studying this problem in some details for two reasons

当开发人员试图向 XML 文档中添加一个层次级别时出现该问题。

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This problem is worth thinking deeply and studying.

这个问题值得人们去思考、去研究。

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