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Theoceanbottom,aregionnearly2.5timesgreaterthanthetotal...
问题详情:Theoceanbottom,aregionnearly2.5timesgreaterthanthetotallandareaoftheEarth,iseventodaylargelyunexplored.Untilaboutacenturyago,thedeep-oceanfloorwascompletelyinaccessibleandhiddenbeneathwatersav...