urbanyl氧异安定(弱安定药)urbanadj.城市的；都市的Urban inbabitant乡镇居民urban diked area城镇圩区urban phenomenon都市的现象Urban geophysics城市地球物理Urban Strategies城市策略UrbanDevelopment城市发展Urban diesel bus公交柴油车Urban flood dike城区防洪堤Urban space form城市空间形态urban facilities市政设施

1. But the aggregated economy effect including urbanization effect and localization effect tends to decline when the cities' population is beyond a certain size.
   但是在达到一定城市规模以后，城市人口规模越大，包含地方化经济和城市化经济的聚集经济效应呈现递减趋势。