It will be the main research field how to combine the important events happened in geological history with these environmental effects of gas hydrate.

指出将地质历史时期的重大事件与天然气水合物产生的这些环境效应结合将成为今后的主要研究方向。

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Data for the map were obtained from U. S. Geological Survey (USGS) and Environmental System Research Institute (ESRI).

地图数据源自美国地质调查局及环境系统研究所。

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