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Anincreasingnumberofexpertsbelievethatmigrantswillexertpositiveeffectsonconstructionofcity.owever,this opinionisnowbeingquestionedbymoreandmorecityresidents,whocomplainthatthemigrantshavebroughtmany seriousproblemslikecrimeandprostitution. 越来越多的专家相信移民对城市的建设起到积极作用，然而，越来越多的城市居民却怀疑这种说法，他们抱怨民工给城市带来了许多严重的问题，象犯罪和卖淫。 Thereisnodenyingthefactthatairpollutionisanextremelyseriousproblem:thecityauthoritiesshouldtakestrong measurestodealwithit. | 
