帮我检查一下这几段话,

下周该我英语演讲,我写了下面这几段话,读起来有点绕嘴,看怎么改.分数倾囊相送.

Goodmorning,everyone!ThetopicofmypresentationtodayisTheSenseofSmell.Asweallknow,ournosehastwomajorfunctions.Oneistoactasaninterfacetoallowourbodytoexchangeairwiththeexternalworld,andtheotheroneistosmellodors.Howmuchdoyouknowaboutoursenseofsmell?

Humansenseofsmellcandetectthousandsofscents.Itenablesustodistinguishwhatisfragrantfromwhatisstink.Italsoallowsustodetectsomethingthatisharmfultous.Therearesomeotheraspectsthatyoumaynotknow.Oursenseofsmellisnotonlyrelatedtosmell,butalsorelatedtotaste.Whenyoueat,onlyfourtasteswhicharesweet,sour,bitterandsaltaredetectedbyyoutongue,andalltheothertastesaredetectedbyyournose.So,havingagoodsenseofsmellcanincreaseyouappetite.Wetendtoeatsomethingthathasapleasantsmell,evenwhenwearenothungry.Thesenseofsmellcanalsoinfluenceyouremotion.Forexample,thesmelloffreshbreaddrivessomepeopleangry,whilethesmelloflemongivesthemaclearmindandhighconcentrationlevels.What’smore,oursenseofsmellplaysanimportantroleinlove.

Weallhavethebadfeelingswhencatchingacold,soitisnotdifficultforustoimaginewhatwillhappenifapersonloseshissenseofsmell.Hecouldnotdistinguishanicecreamandapileofshitwithoutataste.Hedoesnotknowheissurroundedbypoisonousgasthatthreatenshislife.Withoutthesenseofsmell,hissenseoftasteissolimitedthatalmostallfoodstastethesame.Hecannotgetthescentsofflowers,orthescentsofautumnleaves,orthescentsoffruits,orthescentsofsomeone’sskin,andsoon.Thewholeworldistedious.That’sreallyterrible!

Ifyoursenseofsmellisnotsensitive,youcantrytoimproveit.Herearesomemethods.

Themostimportantmethodistoavoidsubstancesthatcanimpairyoursenseofsmell,suchassmokes,alcoholandsomemedicines.Youshouldalsokeepawayfromfoodsthatmakeyournoseuncomfortable,suchasmilk,cheese,andicecream.Aperson’ssenseofsmellbecomessharperafterexercise,sothismethodcanalsobeadopted.Moreover,yoursenseofsmellcanbeimprovedifyouincreasethemoistureinyournose,soyoucanputyournoseonthetopofacupofhotwaterf