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Manypeoplehavewonderedwhatmakestheoceansriseandfallonth...
问题详情:Manypeoplehavewonderedwhatmakestheoceansriseandfallontheword’sbeachestwiceaday.ThosetidesarecausedbytheforceoftheMoon’sgravityandtherotation(自转)oftheEarth.Gravityactsonthecenterofanysolido...