Part 2 is the relevant research progress at home and abroad. Summe up the domestic and international spatial structure of tourism.
第2部分是国内外研究进展，总结了国内外旅游空间结构相关研究进展。
Concludes background and significance, and based on the related studies systematically, analyzed the open space of the relevant research progress, and puts forward the ideas and research framework.
提出了研究的背景和意义，在分析了国内外相关研究的基础上，系统地分析了国内外开敞空间的相关研究进展，并构建了研究思路与框架。
The second part introduced relevant concept of collaboratory, power line communication technology, and power line network unit, etc. as well as the latest research progress both at home and abroad.
第二部分介绍了协同实验室，电力线通信技术，电力线网络单元等相关概念以及国内外最新的研究进展情况。
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