a. being changed over time so as to be e.g. stronger or more complete or more useful
s. (used of societies) having high industrial development
s. (of real estate) made more useful and profitable as by building or laying out roads
a. 发达的（国家或地区）；成熟的
1. The city has developed rapidly in the last few years.
这座城市在过去几年中迅速发展。
2. She developed a new app to help people learn languages.
她开发了一款新应用来帮助人们学习语言。
3. Scientists have developed a vaccine for the disease.
科学家们已经研发出一种疾病疫苗。