英语翻译
Thetraditionalviewsupposesthattheuppermantleoftheearthbehavesasaliquidwhenitissubjectedtosmallforcesforlongperiodsandthatdifferencesintemperatureunderoceansandcontinentsaresufficienttoproduceconvectioninthemantleoftheearthwithrisingconvectioncurrentsunderthemid-oceanridgesandsinkingcurrentsunderthecontinents.Theoretically,thisconvectionwouldcarrythecontinentalplatesalongasthoughtheywereonaconveyorbeltandwouldprovidetheforcesneededtoproducethesplitthatoccursalongtheridge.Thisviewmaybecorrect:ithastheadvantagethatthecurrentsaredrivenbytemperaturedifferencesthatthemselvesdependonthepositionofthecontinents.Suchaback-coupling,inwhichthepositionofthemovingplatehasanimpactontheforcesthatmoveit,couldproducecomplicatedandvaryingmotions.
拜托不要用软件直译了，翻译的比原文还难懂。