Then we introduce models, categories, key technologies, open problems and remarks of e-cash system.

然后介绍了电子现金系统的模型、分类、关键技术、存在的问题及述评。

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No wonder that Christine Lagarde was trying to introduce some light, to go with the gloom, in her remarks at the BBC World Debate, in the main atrium of the International Monetary Fund on Thursday.

BBC: The global economy and the Hollow Men