generally,knowledgegainedfrombooksistheoretical,thatgainedfromexperienceispractical.itisdifficulttoanswerwhichismoreimportanttowepeople.itdependsonthephasesandeventsofourlearning.
knowledgelearnedfrombooksis(instructive教育性的,)whichperhapscannotlearndirectlyfromexperience.weoftenhearthundersandseelightninginthesky,andwecaneasilyfindthatlightningwillbeseensoonerthansoundwillbeheard.accordingtoourexperiencealone,wecannottellwhyithadhappened.butwhenwelearnsomephysicsintextbooks,wewillfindtheanswerclearlythatbecauselighttravelsfasterthansounddoes,ittakeslesstimeforlighttotravelthesamedistancethanforsound.therefore,bookknowledgecaninformussomeusefultheoriesthatcangiveusgeneralideasandhelpusunderstandtherealphenomenonbetter.
inturn,practiceknowledgecheckoutthetheoriesgainedfrombooks.thereisanoldchinesesayingthatpracticeistheonlycriterionofinspectingthetruth.sonotallknowledgefrombooksiscredible,evenfalse.whenaristotlewroteinhistranscriptsthattheearthisthecenterofourplanets,noonedoubtsthisforcenturies.however,whengalileoreadaboutit,hedidnotsuspectitatfirst,butwhenhemadesomeobservationandresearch,hefounditisnotthetruth.thencomesthenewtheory—suncentertheory.
asisshowninthegraph,china'sfooddistributionhastakengreatchangesfrom1960'sto1990'saccordingtothisstatisticsofcereals,vegetable,meat,andfruits,thenumberofthosewhoeatrice,flourorvegetablehasgreatlydecreasedinthepastfourdecades.incontrastofthisthenumberofthosewhoeatoilormeathassharplyincreased.fromsuchdietarychanges,wecanperceivetherapidimprovementofourpeople'slivingstandard.
whydoesthisimprovementoccur?thedirectreasonisthefactthatthechinesepeoplehaveattachedmuchimportancetotheirhealthcare.nationally,china'seconomicgrowthisbooming,andmorepeoplearegettingricher.individually,everyone'sconsumptionoffoodisincreasinglyvaried.inparticular,mostofpeoplearereluctanttoeatmuchvegetable,butmuchmeatandoilintheirdiets.inmyview,thechangesofchina'sdietarydistributionseemtobebothpositiveandnegative.thepositiveaspectisthatchina'seconomicalgrowthhasgivenrisetothehigherlevelofdietarystandard,withmostofpeoplelivingrichandhappy.butthenegativeaspectisthat,i'mafraid,lesseatingvegetablewillleadtopoorerhealth,suchaslackingvitaminnutrientsinone'sbody.therefore,wethinkitnecessaryforthechinesetobeawareofthebalanceddiets:lotsofvegetableandmeat,whichmaygainushealthierbodiesinthenewcentury.
everythingintheuniverseisinconstantchange.andeverythingneedscontinualimprovementiftheeverchangingandincreasingdemandsofhumankindaretobemet.ifiamevergiventhechancetochangeoneimportantthingaboutmyhometown,itwouldbeinternetservice.needlesstosaythatnothinggenerallyrevolutionizedthewayweliveasinternetinthepastdecade.
thus,animprovementinthisvitalservicewouldmeananevenmore,unheardbettermenttothepeopleinmyhometown.itissaidthatinformationispower.truesayingindeed!icanenvisionhoweverythinginmyhometowncouldimprovedramaticallyiftheinternetserviceinitweremadefree,fastandstayingouttherelikeelectricity,telephoneorwaterallthetime.onething,afastfreeandreliableinternetservicecouldimproveinmyhometownisthewaypeoplework.ifthereisathissaidservicepeopleinmyhometownmustnotnecessarilycommutetoafarplacetodotheirjob.thisinturnwouldmeanlesstrafficjams,spaciousworkplace,moretimeforfamilyandrecreationandsoon.thewaypeoplelearnwouldbeanotherimportantthingthatafast,freeandreliableinternetservicecouldbetterinmyhometown.peoplewillhavethechancetogothroughtremendousanddifferentinformationresourcesinaverysmallamountoftime.they,apparentlywillalsotakelesstimetoshareit.thisassuresamorefulfilledlifeformyhometownpeople.
sinceitsadvent,internettouchedeverypartofourlife.itinadazzlingwayimprovedthewaywedobusiness,learnandcommunicate.achangeininternetserviceimpliesgoodwayoflivingforeveryoneinmyhometown.