5、ndpathologicalindex:theoperativetime,thenumberofthelymphnodescleaning,theincidenceofpostoperativecomplications,upperesophagealpositivemarginrate,lengthofstayandthoraciccavitydrainagetubeindwellingtimebetweenthetwogroups.Resultstheindexoftwogroups’data in theoperationtim