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WeknowmoreaboutthesurfaceoftheplanetMarsthanweknowabout...
问题详情:WeknowmoreaboutthesurfaceoftheplanetMarsthanweknowaboutwhatisatthebottomofEarth'soceans.Untilrecently,scientistshadmappedonlyabout20percentoftheseafloor.Butourknowledgeofthedeepseasischanging...