The concept and basic features of natural gas hydrate are limited and the newest domestic and foreign research trends and deep-sea survey results are analyzed in the paper.
界定了天然气水合物的概念与基本特征，分析了国内外最新研究动态和深海调查成果。
According to the research on these representative foreign libraries, we can find there are some common characteristics and trends of them, such as off-site, high-capacity and high-density, etc.
通过对这些有代表性的图书馆储备书库进行研究，可以发现，它们在建设方面呈现出了一些共同的特点和发展趋势，如异地、高容量、高密度等。
This paper mainly gives a review on the progress of regional tourism competition study in foreign countries, and summarizes the characteristic content and trends in each research stage.
本文主要回顾国外区域旅游竞争研究的进展，总结出不同阶段区域旅游竞争研究内容、特点和走向，并简要介绍了国内区域旅游竞争研究的一些代表性观点。
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