1. Learning opportunities: There are more higher education institutions in big cities, which can provide more learning opportunities and better meet learning needs.
2. Employment opportunities: There are many employment opportunities in big cities, which can better meet the employment demand.
3. Living facilities: There are many living facilities in big cities, which can better meet the needs of life.
4. Entertainment activities: There are many entertainment activities in big cities, which can better meet the entertainment needs.
5. Social environment: Big cities have more social resources, which can better meet the needs of social development. I am glad to get your approval. If I am satisfied with my answer, I look forward to your attention and praise. If you have any other questions, you can continue to consult me.