underdeveloped districts的用法和样例：
例句
- Developed regions should assist and stimulate the development of underdeveloped regions in various ways.
发达地区要采取多种方式帮助和带动欠发达地区。 - The principal diseases in developed areas were vaginitis and other diseases, whereas cervicitis and leiomyoma uteri were prevalent in underdeveloped counties.
经济发达地区妇女生殖道疾病以阴道炎和其他疾病为主，而经济欠发达地区以宫颈炎和子宫肌瘤为主。
