an increasing number of experts believe that migrants will exert positive effects on constructionof cityhoweverthis opinion is now being questioned by more and more city residentswho complain that the migrants have brought many serious problems like crime and prostitution
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，像犯罪和卖淫
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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