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An increasing number of experts believe that migrants will exert positive effects on construction of city . However, this opinion is now being questioned by more and more city residents, who 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,象犯罪和卖淫. Many city residents complain that it is so few buses in their city that they have to spend much more time waiting for a bus, which is usually crowded with a large number of passengers. 许多市民抱怨城市的公交车太少,以至于他们要花很长时间等一辆公交车,而车上可能已满载乘客. There is no denying the fact that air pollution is an extremely serious problem :the city authorities should take strong measures to deal with it. 无可否认，空气污染是一个极其严重的问题：城市当局应该采取有力措施来解决它。 An investigation shows that female workers tend to have a favorable attitude toward retirement. 一项调查显示妇女退休. No invention has received more praise and abuse than Internet. 没有一项发明象互联网同时受到如此多的赞扬和批评. | 
