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神秘的海洋世界,面积达3.6亿平方千米,平均深度达3800米,海水的总体积约为13.7亿立方千米。海底世界也像陆
The mysterious sea world, an area of 360 million square kilometers, an average depth of 3800 meters, the total volume of sea water is about 1.37 billion cubic kilometers. Underwater world also like land