不发达的

例句：

1. 1. The economy of this region is underdeveloped compared to other parts of the country.
   与国家其他地区相比，该地区的经济不发达。
2. 2. The government has invested heavily in infrastructure development to promote economic growth.
   政府大力投资基础设施建设以促进经济增长。
3. 3. The company's financial performance has been underdeveloped due to lack of investment in research and development.
   由于缺乏研究和开发投资，该公司的财务状况一直不景气。