Recently,wehavehadadiscussionabouttheadvantagesanddisadvantagesoftheconstructionofanunderground. 　　Ontheonehand,itisverygoodtobuildanunderground.Firstly,thisisanimportantwaytohelpthedevelopmentoftheareabothintranportationandineconomy.Secondly,itisofgreathelptoreducetrafficjamsinthearea.Also,itismoreconvenientforlocalpeopletotootherplaces. 　　Ontheotherhand,therearealsomuchtroubletobuildtheunderground.Aboveall,muchfarmlandisoccupied(used)forit.Next,agreatdealofmoneyisneedtobuildit.What'sworse,morepollutionisalsobroughtaboutwiththebuildingoftheunderground. 　　Inmyopinion,therearemoreadvantagestobuildanundergroundinthelongrun,soIagreetobuildoneforfutherdevelopmentofourarea.