城镇人口的英文：
population in urban areas

参考例句：

Town populations
城镇人口

population是什么意思：
n. 人口；全体居民；动植物总数

The population is on the decline.
人口在减少。

The population is dwindling.
人口在逐渐减少。

Attach importance to the problem of population aging (an aging population )
重视老龄化问题

urban是什么意思：
adj. 城市的；住在都市的；具有城市特征的

Urban life brought urban refinements: newspapers and periodicals, libraries, clubs and societies.
都市生活带来了都市的文化享受：报纸、杂志、图书馆、俱乐部、社交团体。

Urban infrastructure facilities have improved considerably
城市基础设施有了很大改观。

urbanized industry was limited primarily to the Northeast
城市工业主要局限于东北部。

areas是什么意思：
n. 面积；地区；区域；场地；领域，范围，方面

This is a drainage area.
这里是排水区。

The areas of greater rainfall conform roughly with these forested areas.
降雨量较大地区大致与这些森林地区相符合。

The?penalty area?is the rectangular area in front of the goal.
禁区就是指球门前的矩形区域。