One full E-commerce transaction consists of four elements, which are information flow, commodity flow, cash flow and logistics.
一个完整的电子商务交易过程一般包括有四个基本的元素，我们可以称之为“流”：信息流、商流、资金流与物流。
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。
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。
应用推荐