Everyyear,tensofthousandspeoplecrowdintothebigcitiestoseekadecentliving,abetterjob,afasterandmoreexcitinglifestyle.TakeBeijingasanexample,accordingtheleastresearch,thepopulationinBeijingismorethantwentymillions,andof40%ofthemisnotlocal.Withtherapidgrowthofurbanpopulation,thesebigcitieshavemanyproblemsontheirown.該城市人口超過2000萬，其中40%不是本地人口。隨著城市人口的快速增加，這些大城市存在各種各樣的問題。Thefirstproblemiswithmoreandmorepeoplefloodingintothecities,thecitiesinfrastructuresuchaspublictransportation,hospitalsandschool,canhardlymeetthepeople’sneed.Thestreetsarefullofprivatecars,trafficjamscanbeencounteratanymoment.Thehospitalsarefullofpatientsbecausethedoctorsarenotenough.Thehousingpriceisextremelyhighthatmostpeoplecannotaffordonewiththeirwholelifesalary.Itseemsthatthecitiesareonthebrink1ofbreakingdown.如公共交通、醫(yī)療設(shè)備及學(xué)校，很難滿足人們的需求了。大街上都是私家車，隨時隨地都可能遭遇堵車的危險。醫(yī)院里擠滿了病患，因為于自己的房子?？雌饋?，城市處在崩潰的邊緣。Thesecondproblemisthenatureenvironmentofcities.Theairpollution,freshwatershortageandnoisepollutionareworsethanever.Inordertohavemorespacetobuildskyscrapersandinfrastructure,treesarecuttingdownandlakesarelandfilling.Theendlessflowtrafficmakesharshnoisethatpeopleevencannotsleepwellatnight.worse,thefogandhazeissurroundingthecities,thechildrencannotgooutsidetoplay,thepeoplehavetoputonbreathingmasksiftheygooutside.Theairofthecitiesisunbreathabletosomeextent.第二個問題是自然環(huán)境問題?？諝馕廴尽⒌倘?、噪音污染比能睡個好覺。更為嚴重的是，霧霾籠罩著整個城市，小孩子不能出去玩，人們出門一定得帶口罩。城市中的空氣，從某種程度上來說，已經(jīng)不能供給人們呼吸了。2Therearealsootherproblems,thecrimerate.Ascompetitionintensifies,someofthepeoplecannotfindajob,thustheydosomeillegalthingstomakealiving.Suchas,robbing,stealing,evenmurdering.Wecanlearnfromthenewsthatnotasingledaypasseswithoutthereportsofsomebodybeingkidnappedorbeingmurdered.Walkingaloneatnightmakespeoplereallynervous.因此他們干起了違法的事情。偷盜、搶劫，甚至殺人。每天都看新聞夜里讓人們緊張害怕。Alltheseproblemsmakecitiesnotasattractiveasbefore.Someofthemevenmovetothecou