经济不发达地区的英文：
economically underdeveloped areas

参考例句：

Economically underdeveloped areas
经济不发达地区

economically是什么意思：
ad. 节约地,节俭地,经济地

an economical shopper;
精打细算的购物者;

economic planning
制订经济计划

underdeveloped是什么意思：
a. 开发不充分的

The elites are by their nature a factor contributing to underdevelopment.
这些上层人物天生是助长欠发达的因素。

An underdeveloped nation that was a pawn in international politics.
在国际政治中被人利用的不发达国家

a form of infantilism characterized by physical underdevelopment but normal intelligence.
智力正常但身体没有发育的一种状态。

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。