urban problem

例句：

1. 1. The urban area is experiencing a surge in population.
   城市地区正经历人口激增。
2. 2. The architect designed the new urban center with sustainability in mind.
   这位建筑师在设计新的都市中心时考虑了可持续性。
3. 3. The urban planners have been working on improving public transportation.
   城市规划者一直在努力改善公共交通。