So system analysis intrinsically is a grey problem. However, as an important component part of grey system theory, grey system analysis has its specific content and method.
因此，系统分析本质上就是个灰色问题，然而，作为灰色系统理论的重要组成部分，灰色系统分析有其特定的内容与方法。
Each virtual portal has one specific URL mapping referencing its content root.
每个虚拟门户都有引用其内容根的特定url映射。
Each virtual portal has one specific URL mapping referencing its content root.
每个虚拟门户都有引用其内容根的特定url映射。
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