undeveloped areas

• 欠发达地区

undeveloped areas的用法和样例：

例句

1. Medium-sized and small enterprise clusters promote economic and social development in undeveloped areas.
   中小企业集群促进欠发达地区的经济社会发展。
2. It is right to establish economic cooperation between developed and less developed areas.
   在发达地区和相对欠发达地区搞经济协作区，这是对的。