包括北京在内的很多大城市，都计划在未来成为世界级的大都市。
Many big cities, including Beijing, plan to become major world metropolises in the future.
北方地区生活的居民更易患哮喘研究人员说在生活在大都市的居民与大城市之外的居民，哮喘的发病率并没有差异。
Researchers say there is no difference in asthma prevalence rates between metropolitan area residents and people who live outside of metro areas.
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