s. not yet fully developed
a. 开发不充分的, 不发达的, 发育不全的
1. The country is still underdeveloped, lacking basic infrastructure.
这个国家仍然不发达，缺乏基本的基础设施。
2. Many underdeveloped regions struggle to provide adequate education for their children.
许多不发达地区难以为孩子们提供足够的教育。
3. The underdeveloped economy relies heavily on agriculture for survival.
这个不发达的经济在生存上严重依赖农业。