The first and third steps are multi-commodity flow problem; while the second step is the network coding problem.
第一阶段和第三阶段面临的是多商品流问题，第二阶段是网络编码问题。
2
The commodity housing is stacked by multi polyphonic text in social context by using the relations network composed by text structural of intertextuality.
商品住宅是在社会语境中，依靠互文性的文本结构形成的关系网络，将多个复调式的文本进行叠加而组成的。
3
Multi-attribute evaluation problem of commodity is researched when electronic broker settles four different buyer-demanders.