e great efforts should be made to protect local environment and history from the harmful effects of international tourism.
应该采取适当的措施限制外国旅游者的数量，努力保护当地环境和历史不受国际旅游业的不利影响。
9. 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，像犯罪和**.
10. 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。
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