简介：ThispaperinvestigatestheevolutionarychangeintheOF(OF)ofhedgesindifferentmovesofEMRAs(EMRAs).Twocorporaareestablishedforlongitudinalstudy,withCorpusAconsistingofEMRAsfrom1990-1994andCorpusBfrom2005-2009.Generally,nosignificantchangehasbeenfoundinoveralluseofhedges.However,apartfrommove6,7and10,wehavefoundsomeinterestingchangesintheothermoves.Ontheonehand,theOFofhedgesinmove1,move3,move4andmove5showsasignificantincrease.Ontheotherhand,theOFofhedgesinmove2,8,9andmove11showasignificantdecrease.
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